If I ate 5 candies from the box containing 9 candies, I ate 5/9 of all candies. So 5 is 5/9 of 9. What part of 12 is 7?
PLZ HELLLP

(7) is the same problem with different numbers as (4) in another question you posted: https://brainly.com/question/11799042

(8) is not correct. [tex]\mathbf u\cdot\mathbf v=(12)(-15)+(4)(-5)=-200[/tex]

(9) is not correct. The direction of the vector [tex]\langle3,4\rangle[/tex] is [tex]\theta[/tex] where

[tex]\tan\theta=\dfrac34\implies\theta=\tan^{-1}\dfrac34[/tex]

so the applied force is the vector

[tex]\mathbf F=\langle14\cos\theta,14\sin\theta\rangle=\langle11.2,8.4\rangle[/tex]

(if you're not sure how to compute the (co)sine of the inverse-tangent expression, note that a tangent of 3/4 corresponds to a right triangle with hypotenuse 5)

The object is moved 7 ft in the same direction as [tex]\mathbf F[/tex], so that its displacement is given by the vector

[tex]\mathbf d=\langle7\cos\theta,7\sin\theta\rangle=\langle5.6,4.2\rangle[/tex]

Then the work done on the object is the dot product of these two vectors,

[tex]W=\mathbf F\cdot\mathbf d=(11.2)(5.6)+(8.4)(4.2)=98\approx97[/tex]

(the discrepancy here might be coming from finding a numerical value for [tex]\theta[/tex])

(10) is correct. We can find a unit vector pointing in the direction of any vector [tex]\mathbf v[/tex] by dividing [tex]\mathbf v[/tex] by its magnitude:

[tex]\dfrac{\mathbf v}{\|\mathbf v\|}=\dfrac{\frac23\,\mathbf i-\frac12\,\mathbf j}{\sqrt{\left(\frac23\right)^2+\left(-\frac12\right)^2}}=\dfrac45\,\mathbf i-\dfrac35\,\mathbf j[/tex]

To find the total loudness of three earphones with a given ratio is 1176 decibels.

The ratio of loudness of the earphones is 6:5:3. Given that Polina's earphones have a loudness of 420 decibels, we can find the loudness of Lala's and Goffy's earphones. Let the loudness of Lala's earphones be 6x, Polina's is 5x, and Goffy's is 3x.

Adding the loudness of all three earphones, we have: Lala's (6x) + Polina's (420) + Goffy's (3x). Substituting 5x = 420 and solving gives 5x = 420, x = 84. Therefore, the total loudness of all three earphones is 6(84) + 420 + 3(84) = 504 dB + 420 dB + 252 dB = 1176 decibels.

Answer:

3 and 4

Step-by-step explanation:

21/7 = x/1

x = 21/7*1 = 3

16/4 = y/1

y = 16/4*1 = 4

Answer: The number of ballots increases by 3: 3x3=9, 9x3=27, 27x3=81...

After 10 cuts, there will be 59,049 ballots.

Answer:

a = - 15 and b = - 9

Step-by-step explanation:

distribute the left side

- 15x² - 25x - 5b

For - 15x² - 25x - 5b = ax² - 25x + 45

Then the coefficients of like terms must be equal, hence

comparing coefficients of x² term ⇒ a = - 15

comparing constant term ⇒ - 5b = 45 ⇒ b = - 9

Answer: a = -15,   b = -9

Step-by-step explanation:

-5(3x² + 5x + b) = ax² - 25x + 45

-15x² - 25x - 5b = ax² - 25x + 45       distributed -5 on left side

Notice that the middle terms (-25x) are equal, so the the remaining terms will also be equal.

-15x² = ax²  ⇒  -15 = a

 -5b = 45   ⇒   b = -9

Answer: The volume of a block of ice is 9 meters

You have to LxWxH

Answer:

A

Step-by-step explanation:

given y varies directly as x then the equation relating them is

y = kx ← k is the constant of variation

to find k use the given condition x = 24 and y = 360

k = [tex]\frac{y}{x}[/tex] = [tex]\frac{360}{24}[/tex] = 15

Hence y = 15x is the equation → A

Answer: A

Step-by-step explanation:

Answer: h = -4

Step-by-step explanation:

-9h-6+12h+40=22

-9h+12h=22+6-40 "collect all unknown values in a side and collect numbers in other side "

"Don't forget to Change signs"

3h= -12

3h/3 = -12/3 "dividing by 3 in both sides"

h= -4

[tex]-9h-6+12h+40=22\qquad\text{combine like terms}\\\\(-9h+12h)+(-6+40)=22\\\\3h+34=22\qquad\text{subtract 34 from both sides}\\\\3h=-12\qquad\text{divide both sides by 3}\\\\\boxed{h=-4}[/tex]

Answer:

y = -2x+11

Step-by-step explanation:

If we have a slope and a line, we can use the slope intercept form of a line

y-y1 = m(x-x1)

where (x1,y1) is the point and m is the slope.

Substitute in what we know

y-5 = -2 (x-3)

We want it in slope intercept form which is y = mx+b

Distribute the -2

y-5 = -2x+6

Add 5 to each side

y-5+5 = -2x +11

ANSWER:

y = -2x + 8

ABOUT POINT SLOPE FORM:

ABOUT SLOPE INTERCEPT FORM:

y - Y1 = m (x - X1)

y - 5 = -2 (x - 3)

y - 5 = -2x + 3

 + 5           + 5

y = -2x + 8 --- IN SLOPE INTERCEPT FORM

Hope this helps you!!! :)

check the picture below.

If it's a graph: Solutions are points of intersection

The same line means infinitely many solutions

Parallel lines = never intersects = no solution

1 point of intersection = 1 solution

If it's a system of equations:

If you get _*x = _(a number), 1 solution (divide by the coefficient, and get only 1 possible value)

If you get x = x, infinitely many solutions (x can be anything and still equal itself)

If you get two different constants equaling (such as 1 = 2), there is no solution because no value of x can make those two values equal.

Answer:

He would make $4391.92

The constant of proportionality is 14.6

Step-by-step explanation:

If Daniel works 213 hours and makes $1820.00

(I assume that is a typo and he made 1820. not 18.20)

How much does he make per hour

$1820/213 = $8.54 per hour

Now if he works 514 hours

514 * 8.54/hour = $4391.92

y = kx, where k is the constant of proportionality

a = 14.6h,

The constant of proportionality is 14.6

Answer:

D

Step-by-step explanation:

Answer: We can say that (a/b)^2 is a rational number

================================================

Proof:

Rational means the number is a ratio of two whole numbers

If 'a' is rational, then a = p/q for some whole numbers p,q (eg: p = 2, q = 3 so p/q = 2/3)

The same applies for b, which I'll let b = r/s, with r & s being whole numbers.

To avoid division by zero, I'm going to make p,q,r,s nonzero which leads to 'a' and 'b' being nonzero.

Now let's divide 'a' over b to get

a/b = (p/q) divided by (r/s)

a/b = (p/q) * (s/r)  .... flip the second fraction; multiply

a/b = (ps)/(qr)

The new numerator is p*s which is a whole number (because the product of two whole numbers is also a whole number). The same goes for q*r in the denominator. So a/b is rational if both 'a' and 'b' are rational together.

We can extend this to (a/b)^2 as well

(a/b)^2 = [ (ps)/(qr) ] ^2

(a/b)^2 = [ (ps)^2 ]/[ (qr)^2 ]

(a/b)^2 = (p^2*s^2)/(q^2*r^2)

p is a whole number, and so is p^2. Same for s and s^2. Overall, the final numerator p^2*s^2 is also a whole number. Similarly, q^2*r^2 is a whole number.

So we have yet another ratio of two whole numbers proving that (a/b)^2 is a rational number.

Answer:

D

Step-by-step explanation:

Answer:

D) 67  

Step-by-step explanation:

 j = 4N + 11

N = 14           Insert the value of N

j = 4×14 + 11    

j = 56 + 11

j = 67

Jupiter has 67 moons.

Answer:

D

Step-by-step explanation:

use the sine ratio in the right triangle

sin x = [tex]\frac{opposite}{hypotenuse}[/tex] = [tex]\frac{8.9}{10.9}[/tex], hence

x = [tex]sin^{-1}[/tex]( [tex]\frac{8.9}{10.9}[/tex] ) → D

Answer:

D

Step-by-step explanation:

Answer:

136 ounces

Step-by-step explanation:

So you take 8.5 lbs and multiple it by the second number in the ratio this only works if the first number is 1 and it represents what you are starting with  

8.5*16=136

To convert pounds to ounces, multiply the number of pounds by 16. An 8.5 pound baby weighs 136 ounces.

To convert pounds to ounces, you need to multiply the number of pounds by 16 because there are 16 ounces in 1 pound.

In this case, an 8.5 pound baby would be equivalent to:

8.5 pounds x 16 ounces/pound = 136 ounces

Therefore, an 8.5 pound baby weighs 136 ounces.

https://brainly.com/question/2909742

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You can use same operations on both sides such that both sides' x value come on one side and rest of the values go on other side so that you get what is equal to x.

The value of x is 6

It is because [tex]a^x[/tex] where x is a variable and "a" is a constant, is a function. A function only outputs single value to each input.

If for x = p and x = q, we get same value, then we will have  [tex]a^x[/tex]  not being a function. Thus, for that to be a function, we need those inputs same too for output to be same.

Thus,  [tex]a^p = a^q \implies p = q[/tex]

Remember that we need base to be same(here a is base and p and q are exponents)

We can use the fact that 64 is cube of 3 and can use the above stated fact.

Thus, we have:

[tex]4^{(x+30)} = 64^{(2x)}\\4^{x+30} = 4^{3^{2x}} \\\\\text{since power of power will multiply, thus,}\\\\4^{x + 30} = 4^{6x}\\\\or\\\\x+30 = 6x\\\\\text{Subtracting x on both sides}\\\\30 = 5x\\\\\text{Dividing by 5 on both sides}\\\\6 = x\\x = 6[/tex]

Thus, The value of x is 6

Learn more about base and exponent here:

https://brainly.com/question/15722035

Answer:

p = 10t - 100

Step-by-step explanation:

Perform the indicated multiplication:  p = 10t - 100.

The equivalent form of the algebraic equation p = 5(2t - 20) is p = 10t - 100, which is a simplified linear representation of the original equation.

The student is looking for an equivalent form of the algebraic equation p = 5(2t - 20). By distributing the 5, we obtain p = 10t - 100. This is now a simplified linear equation representing the same rule as the original equation. It's also similar to manipulating a quadratic equation to find the value of t, as shown in the other examples provided. However, this linear equation doesn't require solving for t; rather, we're simply rewriting it in a more straightforward format.

Answer:

2y

Step-by-step explanation:

Simplifying

21x + -42y = 0

Solving

21x + -42y = 0

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '42y' to each side of the equation.

21x + -42y + 42y = 0 + 42y

Combine like terms: -42y + 42y = 0

21x + 0 = 0 + 42y

21x = 0 + 42y

Remove the zero:

21x = 42y

Divide each side by '21'.

x = 2y

Simplifying

x = 2y

Answers are attached in the pictures. Solutions are in RED.

Answer:

12. 7.5

13. 0.224

14. 193.5

15. 2/3

16.  5/7

17. -10

18. 2:1

19. 16

20. 150

21. 46,200

22. 4

23. 18

24. 5.29

25. 7.07

26. 19.80

27. 15.87

28. 9.80

29. 6.71

30. 1.26

Step-by-step explanation:

12. 5/8 = x/12

  8x = 60

   x = 7.5

13. x/1.11 = 1/5

  5x = 1.12

   x = 0.224

14. 6x /27 = 43

      6x = 1161

         x = 193.5

15. x+2)/3 = 8/9

   9x + 18 = 24

   9x = 6

  x = 2/3

16. (3x -5)/4 = -5/7

     21x - 35 = -20

     21x = 15

     x = 5/7

17. (x-2)/4 = (x+4)/2

    2x - 4 = 4x + 16

    -2x = 20

     x = -10

18.  9 grams of fat.

      6 grams are saturated.

     9-6 = 3 grams are cheese.

  ratio of saturated to cheese = 6:3

                                                   = 2:1

19. goats to sheep = 4:7

     7/11 x = 28

     x = 28 × 11/7

     x = 44

   goats = 44-28 = 16

20. 280:4 = 10,500:x

   280/4 = 10,500/x

  280x = 42000

     x = 150

21. 42:2 = x:2200

   42/2 = x/2200

   92,400 = 2x

    x = 46,200

22. √(2×8) = √16 = 4

23. √(9×36) = √324 = 18

24. √(4×7) = √28 = 5.29

25. √(5×10) = √50 = 7.07

26. √(28×14) = √392 = 19.80

27. √(7×36) = √252 = 15.87

28. √(8×12) = √96  = 9.80

29. √(3×15) = √45 = 6.71

30. √4/5 × 2) = √8/5 = 1.26

Answer:

13 y^2 - 9 x y + 3 x^2

Step-by-step explanation:

Simplify the following:

6 x^2 - 7 x y + 8 y^2 - (x^2 - 3 x y - y^2) - (2 x^2 + 5 x y - 4 y^2)

-(x^2 - 3 x y - y^2) = -x^2 + 3 x y + y^2:

6 x^2 - 7 x y + 8 y^2 + -x^2 + 3 x y + y^2 - (2 x^2 + 5 x y - 4 y^2)

-(2 x^2 + 5 x y - 4 y^2) = -2 x^2 - 5 x y + 4 y^2:

6 x^2 - 7 x y + 8 y^2 - x^2 + 3 x y + y^2 + -2 x^2 - 5 x y + 4 y^2

Grouping like terms, 6 x^2 - 7 x y + 8 y^2 - x^2 + 3 x y + y^2 - 2 x^2 - 5 x y + 4 y^2 = (8 y^2 + y^2 + 4 y^2) + (-7 x y + 3 x y - 5 x y) + (6 x^2 - x^2 - 2 x^2):

(8 y^2 + y^2 + 4 y^2) + (-7 x y + 3 x y - 5 x y) + (6 x^2 - x^2 - 2 x^2)

8 y^2 + y^2 + 4 y^2 = 13 y^2:

13 y^2 + (-7 x y + 3 x y - 5 x y) + (6 x^2 - x^2 - 2 x^2)

x y (-7) + x y 3 + x y (-5) = -9 x y:

13 y^2 + -9 x y + (6 x^2 - x^2 - 2 x^2)

6 x^2 - x^2 - 2 x^2 = 3 x^2:

Answer:  13 y^2 - 9 x y + 3 x^2

There is only one solution to this system of equations.  The solution is where the two equations meet, which in this system is (2, 1).

Answer:

One Solution

Step-by-step explanation:

GOT IT RIGHT ON EDGE 2020

Answer:

7.0

Step-by-step explanation:

If we had the number 7.1  the 1 is the tenth digit. .

So 7 to the nearest tenth is written 7.0.

Answer:

7.5 is exactly halfway between 7 and 8. Therefore, 7.5 rounds to 8.

Step-by-step explanation:

To round to the nearest tenth using a number line, look at the tenth place value closest to the number you are rounding.

Answer: a=2 b=5 c=-7

parabola equation is y = 2x^2+5x-7 = 0

Step-by-step explanation:

Substitute (x,y) into y = a x^2 + b x + c

(2,11)      11 = 4a + 2b + c

(-1,-10)  -10 = a - b + c

(-4,5)      5 = 16a -4b + c

Solve the linear system in a, b, c

Det[{{4,2,1},{1,-1,1},{16,-4,1}}] = 54

Det[{{11,2,1},{-10,-1,1},{5,-4,1}}] = 108

Det[{{4,11,1},{1,-10,1},{16,5,1}}] = 270

Det[{{4,2,11},{1,-1,-10},{16,-4,5}}] = -378

a = 108/54 = 2

b = 270/54 = 5

c = -378/54 = -7

parabola equation is y = f(x) = 2x^2+5x-7

f(2) = 8+10-7 = 11 ✔

f(-1) = 2-5-7 = -10 ✔

f(-4) = 32-20-7 = 5 ✔

Answer:

She need 72 index cards.

Step-by-step explanation:

Ms. James has a 6 square foot bulletin board and a 12 square food bulletin board and she wants to cover both boards with index cards without gaps or overlaps.

Each index card has an area of [tex]\dfrac{1}{4}[/tex] square foot.

Dividing the area of each board with the area of the index card will yield the the number of cards she needs to cover up completely.

Let us assume T₁ and T₂ are the number of cards she needs to cover 6 square feet food bulletin board and 12 square feet food bulletin board respectively. So

[tex]T_1=\dfrac{6}{\frac{1}{4}}=24,\\\\T_2=\dfrac{12}{\frac{1}{4}}=48[/tex]

Therefore, in total she need 24+48=72 index cards.

Answer:

Option D. [tex]\frac{24}{7}[/tex].

Step-by-step explanation:

In any right angle triangle tangent of an angle is the ratio of opposite side and adjacent side.

tan x =[tex]\frac{\text{Opposite side (24)}}{\text{Adjacent side (7)}}[/tex]

        = [tex]\frac{24}{7}[/tex]

therefore, Option D. [tex]\frac{24}{7}[/tex] is the answer.

Answer:

x = 16/5

Step-by-step explanation:

(x-2)= -1/4(x-8)

Multiply each side by -4 to clear the fraction

-4 (x-2) = -4*-1/4 (x-8)

Distribute

-4x+8 = x-8

Add 4x to each side

-4x+4x+8 = x+4x-8

8 = 5x-8

Add 8 to each side

8+8 = 5x-8+8

16 = 5x

Divide each side by 5

16/5 = 5x/5

16/5 =x

Answer:The answer is 7 hours here is how I solved it. If it's out of 500 pieces and you've already done 325 then lets minus that so we only have to deal with the left over pieces. So 500- 325 which will give you 175 from there let's divide it by 25 to see how many hours it will take. Once you divide you will get 7 you can double check by doing 7 times 25 then add that to 325 to get 500 pieces.

Step-by-step explanation:

Answer: a - add 3 to both sides

Step-by-step explanation: you want to have the variable with the number all to itself to solve for x, so you have to add 3 to both sides to get 3/4x=-15. then divide by 3/4 to both sides and you will get a final answer.