Maria drives to school in 20 minutes. She drives home in 24 minutes. What was her average driving speed in terms of d, the distance from her home to school?

At least 5 Schools have participated

Answer:

Step-by-step explanation:

[tex]P(A|B)=\dfrac{P(A\ \cap\ B)}{P(B)}\\\\\text{A and B are independent events. Therefore}\ P(A\ \cap\ B)=P(A)\cdot P(B).\\\\\text{Substitute:}\\\\P(A|B)=\dfrac{P(A)\cdot P(B)}{P(B)}\qquad\text{cancel}\ P(B)\\\\P(A|B)=P(A)\to P(A|B)=0.3[/tex]

Final answer:

Since A and B are independent events, P(A/B) is equal to P(A), which is 0.30.

Explanation:

The student is asking for the calculation of P(A/B), which is the probability of event A given that event B has occurred. However, since A and B are independent events, the occurrence of B does not affect the probability of A happening. Hence, P(A/B) is simply P(A), which is 0.30.

For independent events, the probability of A occurring given B has occurred is the same as the probability of A occurring on its own, because the two events do not influence each other:

P(A/B) = P(A) = 0.30

Secant sec(x) = 1/cos

Answer:

N=N(sub o)e^-kt  

N/N(sub o)=e^-kt  

70/100=e^-kt  

ln .7=-.0001t  

t=ln .7/-.0001

ur welcome that is your Answer.

Step-by-step explanation:

75 // common factor is 3

Answer: THE ANSWER IS R(x)=9x+69

Step-by-step explanation:

Answer:

[tex]R(x)= 20x^2+300x+1080[/tex]

Step-by-step explanation:

The number of teams who entered in  basketball tournament

[tex]T(x)=4x+24[/tex]

The entire fee paid by each team to enter the tournament

[tex]F(x)=5x+45[/tex]

Total entry fees = Number of teams * fee paid by each term

[tex]R(x)= T(x) * F(x)[/tex]

[tex]R(x)= (4x+24) *(5x+45)[/tex]

USe FOIL method to multiply it

[tex]R(x)= 20x^2+180x+120x+1080[/tex]

combine like terms

[tex]R(x)= 20x^2+300x+1080[/tex]

Answer:

42 min

Step-by-step explanation:

Joanna takes 2 mins to send a text.

2 mins = 2 x 60 sec = 120 sec

Anna takes 40 seconds to send a text

120 ÷ 40 = 3

Anna can text 3 messages in 120 sec

Together, in 120 sec ,

both of them can send out 1 + 3 = 4 texts

Number of 120 seconds needed to send 84 texts

= 84 ÷ 4

= 21

Number of seconds needed

= 21 x 120

= 2520

25020 sec = 2620 ÷ 60 min = 42 min

Answer: [tex]JK=8[/tex]

Step-by-step explanation:

You can observe in the figure that JK is a tangent and KH is a secant and both intersect at the point K. Then, according to the Intersecting secant-tangent Theorem:

[tex]JK^2=KE*KH[/tex]

You know that:

[tex]KH=KE+HE[/tex]

Then KE is:

[tex]KE=KH-HE[/tex]

[tex]KE=16-12[/tex]

[tex]KE=4[/tex]

Now you can substitute the value of KE and the value of KH into  [tex]JK^2=KE*KH[/tex] and solve for JK. Then the result is:

[tex]JK^2=4*16\\JK^2=64\\JK=\sqrt{64}\\JK=8[/tex]

Both intersecting point K, JK is a tangent and KH is a secant. You can use the intersecting secant-tangent Theorem:

JK^2=KH*EK

First you can do

KH=EK+EH

KE=4

Then you can substitute.

JK^2=64

JK=8

Answer:

It would take Jenny 20 minutes to walk 1 mile

Step-by-step explanation:

To find how many minutes it would takes her to walk 1 mile, you have to find out the rate of her walking 2.5 miles.

So divide 2.5/50

She walked 0.05 miles per minute

there are 20 0.05 in one mile so

It would take Jenny 20 minutes to walk 1 mile

Hope this helps! If you don't mind, please mark as brainliest! Thx! :)

Answer:

The point that is being intersected is (4,2).

The angle between the legs labeled [tex]x[/tex] and [tex]y[/tex] is complementary to the angle with measure 31 degrees, so that angle has measure 90 - 31 = 59 degrees. Then

[tex]\sin59^\circ=\dfrac{400}x\implies x=\dfrac{400}{\sin59^\circ}\approx466.7[/tex]

Answer:

x=54

Step-by-step explanation:

Because one side of the triangle is tangent (touching) to the circle while the other is the radius itself, we can conclude that the angle that is not named is 90°.

Knowing this, we can then add 36° and 90° to get 126°.

All of the angles in a triangle add up to 180°; therefore, we can subtract 126° from 180° to get 54°.

I really hope this helps and explains it well!

Answer:

x = 54°

Step-by-step explanation:

Since the lower segment is a tangent to the circle then

the angle between the tangent and the diameter is right.

The sum of the 3 angles in a triangle = 180°

Subtract the sum of the 2 known angles from 180 for x, that is

x = 180° - (90 + 36)° = 180° - 126° = 54°

The answer is x=8.6 units

After simplifying the fraction, we find that x = 7/17.

In
ΔABC, J is on AB, K is on BC, and JK is parallel to AC. We're given that JB = 5, AJ = 17, BK = x+4, and KC = 5x. By the properties of parallel lines and similar triangles, we can state that ΔAJK ~ ΔACB. Considering the sides of these triangles, the ratios of corresponding sides must be equal, which gives us the proportion:

AJ/JB = AC/BC

Substituting in given values and variables, we get:

17/5 = (17 + 5)/(5x + x + 4)

Solving for x, we multiply each side by the denominators to eliminate the fraction:

17(5x + x + 4) = 5(22)

85x + 17x + 68 = 110

102x + 68 = 110

102x = 42

x = 42/102

x = 7/17

After simplifying the fraction, we find that x = 7/17.

Answer: Third Option

-2

Step-by-step explanation:

I want to find the minimum value of a function with the form

[tex]y = asin (x-c)[/tex]

But we do not know the value of the coefficient "a", which is the amplitude, nor of the constant c.

However, in the attached graph we have the function.

The minimum value of a function is the lowest value of the variable y that the function can reach.

Observe in the graph that the function is periodic and reaches its maximum value at [tex]y = 2[/tex] and its minimum value at [tex]y = -2[/tex]

Therefore the minimum value would be [tex]y = -2[/tex]

Answer:

A. 176

Step-by-step explanation: First, to find the surface area to each triangle, you multiply the base times the height by 1/2. It is 28 for each triangle. Multiply that by 4, and you get 112. Then, the surface area of the square on bottom is 64. When added together, you get 176. No rounding needed. Hope it helped and is correct!

Answer:

Step-by-step explanation:

First, to find the surface area to each triangle, you multiply the base times the height by 1/2. It is 28 for each triangle. Multiply that by 4, and you get 112. Then, the surface area of the square on bottom is 64. When added together, you get 176. No rounding needed. Hope it helped and is correct!

Answer:

Final answer in simplified form is [tex]9x^2-4x+5 [/tex]

Step-by-step explanation:

Given expression is [tex](x+2)-(-9x^2+5x-3) [/tex]

Now we need to find an equivalent expression for[tex](x+2)-(-9x^2+5x-3) [/tex]

First we can distribute the negative sign and remove the parenthesis the combine like terms

[tex](x+2)-(-9x^2+5x-3) [/tex]

[tex]=x+2+9x^2-5x+3 [/tex]

[tex]=9x^2+x-5x+2+3 [/tex]

[tex]=9x^2-4x+5 [/tex]

Hence final answer in simplified form is [tex]9x^2-4x+5 [/tex]

Answer:

  $328.95

Step-by-step explanation:

By the Pythagorean theorem, the diagonal of the garden has a length that is the root of the sum of the squares of the side lengths:

  d = √(77² +36²) = √7225 = 85

Then the cost of the fence is the product of this number of feet and the cost per foot:

  (85 ft)·($3.87/ft) = $328.95

The total cost of the length of the fence is $328.95

The garden is in the form of a rectangle. A line that divides the rectangle from one corner to the other corner is known as an hypotenuse. The hypotenuse divides the rectangle into two right-angles triangles. The length of the hypotenuse has to be first determined using Pythagoras theorem.

The Pythagoras theorem: a² + b² = c²

where a = length

b = base

c = hypotenuse

77² + 36²

5929 + 1296 =7225

√7225 = 85 feet

Cost of the total length of the fence = length of fence x cost per foot

$3.87 x 85 = $328.95

To learn more about Pythagoras theorem, please check: brainly.com/question/20936855?referrer=searchResults

Answer:

C

Step-by-step explanation:

Given

cosB = [tex]\frac{adjacent}{hypotenuse}[/tex] = [tex]\frac{BC}{A B}[/tex] = [tex]\frac{255}{257}[/tex]

Then the hypotenuse AB = 257 and BC = 255

sinA = [tex]\frac{opposite}{hypotenuse}[/tex] = [tex]\frac{BC}{AB}[/tex] = [tex]\frac{255}{257}[/tex]

A = [tex]sin^{-1}[/tex] ([tex]\frac{255}{257}[/tex]) = 82.8° → C

Answer:

Step-by-step explanation:

Amplitude is twice the coefficent of the sine function. In this case, [tex]2*2=4[/tex]

Period is [tex]2\pi[/tex] divided by the coefficent of x, in this case, [tex] \frac {2\pi} 1 =2\pi [/tex]

Phase shift, is how much you sum or subctract from x inside the sine, in this case [tex] \pi [/tex].

Midline you get by hiding the sine and reading what's left, in this case, -4.

Answer:

y = 8

Step-by-step explanation:

Since the 2 triangles are similar then the ratio of corresponding sides are equal, that is the sides 15 and 10 and y + 4 and y, thus

[tex]\frac{15}{10}[/tex] = [tex]\frac{y+4}{y}[/tex] ( cross- multiply )

10(y + 4) = 15y ← distribute left side

10y + 40 = 15y ( subtract 10y from both sides )

40 = 5y ( divide both sides by 5 )

8 = y

Answer:

P(A ∩ B) = 11/15 ⇒ answer A

Step-by-step explanation:

* Lets revise the meaning of ∪ and ∩

# A ∪ B means all the elements in A or B without reputation

- Ex: If A = {2 , 3 , 5} and B = {3 , 4 , 7}

∴ A ∪ B = {2 , 3 , 4 , 5 , 7} ⇒ we don't repeat the element 3

# A ∩ B means all the elements in A and B

- Ex: If A = {2 , 3 , 5} and B = {3 , 4 , 7}

∴ A ∩ B = {3}

- From the examples above

∵ n(A) = 3 and n(B) = 3

∵ n(A ∪ B) = 5

∵ n(A ∩ B) = 1

∴ n(A) + n(B) = n(A ∪ B) + n(A ∩ B)

* Now lets solve the problem

∵ P(A ∪ B) = 11/15

∵ P(x) = n(x)/total

- That means the total elements in the problem is 15 and n(A ∪ B) is 11

∴ n(A ∪ B) = 11

∵ P(A) = 2/3 ⇒ simplest form

- To find P(A) without simplification and you now the total is 15

  then multiply up and down by 5

∴ P(A) = (2×5)/(3×5) = 10/15

∴ n(A) = 10

∵ P(B) = 4/5 ⇒ simplest form

- To find P(B) without simplification and you now the total is 15

  then multiply up and down by 3

∴ P(B) = (4×3)/(5×3) = 12/15

∴ n(B) = 12

- To find n(A ∩ B) use the rule above

∵ n(A) + n(B) = n(A ∪ B) + n(A ∩ B)

∵ 10 + 12 = 11 + n(A ∩ B) ⇒ subtract 11 from both sides

∴ 11 = n(A ∩ B)

- The number of elements in A ∩ B is 11

∵ P(A ∩ B) = n(A ∩ B)/total

∴ P(A ∩ B) = 11/15

Answer:

  5

Step-by-step explanation:

Vertices are where edges meet. Count the circles on the diagram below.

Answer:

Step-by-step explanation:

It's a quadratic function. The graph is a parabola.

The coefficient of x² is equal 1 > 0. Therefore the parabola is open up.

Conclusion: The minimum is in a vertex.

[tex]f(x)=ax^2+bx+c\\\\(h,\ k)-vertex\\\\h=\dfrac{-b}{2a},\ k=f(h)[/tex]

We have

[tex]g(x)=x^2-6x-12\to a=1,\ b=-6,\ c=-12\\\\h=\dfrac{-(-6)}{2(1)}=\dfrac{6}{2}=3\\\\k=g(3)=3^2-6(3)-12=9-18-12=-21\\\\(3,\ -21)-vertex[/tex]

Answer:

1,560

Step-by-step explanation:

156=2

2x10=20

156x10=1560

Answer:156 times 10 thats your answer

Step-by-step explanation:

Answer:

b = 14[tex]\sqrt{2}[/tex]

Step-by-step explanation:

Since the triangle is right use the cosine ratio to find b

cos45° = [tex]\frac{adjacent}{hypotenuse}[/tex] = [tex]\frac{b}{28}[/tex]

Multiply both sides by 28

28 × cos45° = b

28 × [tex]\frac{\sqrt{2} }{2}[/tex] = b ( cancel the 28 and 2 )

b = 14[tex]\sqrt{2}[/tex]

Answer:

14√2.

Step-by-step explanation:

This is a 45-45-90 triangle so the ratio of the sides is 1:1:√2.  ( By the Pythagoras theorem).

so b / 28 = 1 / √2

√2 b = 1*28

b = 28 / √2

= 28√2 / 2

= 14√2  answer.

Answer:

A. It has reflectional symmetry

B. It is symmetrical

D. It has five lines of symmetry

Step-by-step explanation:

we know that

A regular pentagon has 5 sides and 5 lines of symmetry. The number of lines of symmetry in a regular polygon is equal to the number of sides

Every regular polygon has reflectional symmetry

Regular polygons are symmetrical

therefore

A. It has reflectional symmetry ------> Is true

B. It is symmetrical -----> Is true

C. It has exactly one line of symmetry ----> Is false

D. It has five lines of symmetry -----> Is true

Answer:

A. It has reflectional symmetry

B. It is symmetrical

D. It has five lines of symmetry

Step-by-step explanation:

Answer:

The correct answer option is D) 2.

Step-by-step explanation:

We are given the value of x and f(x) in a table and we are to find the average rate of change for the given function from x = 1 to x = 4.

To find that, we will calculate the ration of change in y to change in x.

Average rate of change = [tex] \frac { 1 0 - 0 } { 4 - ( - 1 ) } = \frac { 1 0 } { 5 } [/tex] = 2

The average rate of change of the function from x = 1 to x = 4 is calculated by subtracting the function values at these points and dividing by the difference in x-values, which results in 2.

To calculate the average rate of change, you subtract the values of the function at the two points, and then divide by the difference in the x-values. For the function given with range x = 1 to x = 4, the average rate of change is calculated as follows:

[f(4) - f(1)] / (4 - 1) = (10 - 4) / (4 - 1) = 6 / 3 = 2.

Therefore, the average rate of change for the specified range is 2

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Answer:

4.62%

Step-by-step explanation:

To find the percentage of patient with AB blood type, we would need:

If you see the Row labeled "AB" and go to the last column labeled "Total", we can see that 33 patients have blood type AB.

If you look at the right most block, we see the grand total of all patients of all blood types, which is 714 patients.

To find our answer, we divide 33 by 714 and multiply by 100 to get percentage.

Percentage of patients with blood type AB = [tex]\frac{33}{714}*100=4.62[/tex]

Answer:

4.6%

Step-by-step explanation:

To find the percentage of patient with AB blood type, we would need:

total number of patients with blood type AB

total number of all patients of all blood types

(33/714)* 100 = 4.6%

Answer:

Its C just got it right.

Step-by-step explanation:

Answer:

Option C

Step-by-step explanation:

Given that at the end of each semester in college, a survey is given to students to get feedback on the course. One of the questions on the survey is shown below.

The course met my expectations.

1. Strongly Agree

2. Slightly Agree

3. Agree

4. Slightly Disagree

5. Strongly Disagree

The problem in this survey is the difference in people's mind set about saying the answer. One person may say strongly agree for agree also while other person may do the reverse.

Hence option C is right

C. The answer choices could be interpreted differently by different students.

Answer:

It's the second option x = (3y - 11) / 5.

Step-by-step explanation:

3/5 = x+1/y-2

Cross multiplying:

3(y - 2) = 5(x + 1)

3y - 6 = 5x + 5

5x =  3y - 6 - 5

5x = 3y - 11

x = (3y - 11) / 5.