Solve the equation. 42x – 5 = 64

Answer:

Step-by-step explanation:

10-2= the number of cars that finished

Answer:

  y = 0.0018(x -105)² +7

Step-by-step explanation:

The vertex of the function is at (x, y) = (105, 7), so the equation will be of the form ...

  y = a(x -105)² +7

We can use x=0 to find the value of "a". At x=0, y=27, so ...

  27 = a(0 -105)² +7

  20 = 11025a

  20/11025 = a ≈ 0.0018

So, the model is ...

  y = 0.0018(x -105)² +7

Answer:

d

Step-by-step explanation:

Answer:

B

Step-by-step explanation:

Given focus as (h,k) and directrix as y = mx + b, the equation of a parabola is given as:

[tex]\frac{(y - mx - b)^2}{m^2 +1}=(x - h)^2 + (y - k)^2[/tex]

Hence, from the given focus & directrix, we have:

h = -1

k = -1

m = 0

b = 1

We can plug them into the formula and arrange to get:

[tex]\frac{(y - mx - b)^2}{m^2 +1}=(x - h)^2 + (y - k)^2\\\frac{(y - (0)x - 1)^2}{0^2 +1}=(x - (-1))^2 + (y - (-1))^2\\\frac{(y-1)^2}{1}=(x+1)^2+(y+1)^2\\y^2-2y+1=x^2+2x+1+y^2+2y+1\\-2y-2y=x^2+2x+1\\-4y=x^2+2x+1\\y=-\frac{1}{4}x^2-\frac{1}{2}x-\frac{1}{4}[/tex]

B is the correct answer.

Given.

-x + 3.9

Plug in.

-7.2 + 3.9 = -3.3

Answer.

-3.3

Answer:

11.1

Step-by-step explanation:

−(−7.2)+3.9

=7.2+3.9

=11.1

Answer:

a) AB = 17 m

b) AC = 20.8 m

Step-by-step explanation:

Pythagorean theorem

a^2 + b^2 = c^2

a)

AB^2 = (26-11)^2 + 8^2

AB^2 = 15^2 + 8^2

AB^2 =  225 + 64

AB^2 = 289

AB = 17 m

b)

AC^2 = AB^2 + BC^2

AC^2 = 17^2 + 12^2

AC^2 =289 + 144

AC^2 = 433

AC = 20.8 m

Answer:

250d + 300

Step-by-step explanation:

Answer: (B) = 110.2

50*2.2046 = 110.23

Answer:

132 degrees.

Step-by-step explanation:

SR and PQ are both 48 degrees. A circle is 360 degrees.

360-96 because 48+48 is 96, is 264. PS and QR are also the same so 264/2 is 132.

Answer:

they are the same . If u add (-5) + (-30) that will be equal to (-35)

Answer:

25

Step-by-step explanation:

1) -5-(-30)

2) -5+30

3) 25

Answer:

[tex]x =7\sqrt{3}[/tex]

Step-by-step explanation:

By definition, the tangent of a z-angle is defined as

[tex]tan(z) =\frac{opposite}{adjacent}[/tex]

For this case

[tex]opposite = 7[/tex]

[tex]adjacent = x[/tex]

[tex]z=30\°[/tex]

So

[tex]tan(30) =\frac{7}{x}[/tex]

[tex]x =\frac{7}{tan(30)}[/tex]

[tex]x =7\sqrt{3}[/tex]

Answer:

7√3 = x

Step-by-step explanation:

Arbitrarily choose to focus on the 30 degree angle.  Then the side opposite this angle is 7 and the side adjacent to it is x.

tan 30 degrees = (opp side) / (adj side), or (1√3) = 7 / x.

Inverting this equation, we get √3 = x/7.

Multiplying both sides by 7 results in 7√3 = x

Answer:

interval notation: [-5,infinity)

or answer X=> -5

Step-by-step explanation:

For this case we must find the domain of the following function:

[tex]f (x) = \sqrt {x + 5}[/tex]

By definition, the domain of a function is given by all the values for which the function is defined.

The given function stops being defined when the argument of the root is negative. Thus, the domain is given by all values of "x" greater than or equal to -5.

Answer:

Domain: [tex]x\geq-5[/tex]

Answer:

x = 2

Step-by-step explanation:

Isolate the variable, x. Note the equal sign, what you do to one side, you do to the other. Do the opposite of PEMDAS.

PEMDAS = Parenthesis, Exponents (& roots), Multiplication, Division, Addition, Subtraction,

and is the order in which you follow for order of operation questions.

First, subtract 5 from both sides.

2x + 5 (-5) = 9 (-5)

2x = 9 - 5

2x = 4

Isolate the x, Divide 2 from both sides:

(2x)/2 = (4)/2

x = 4/2

x = 2

x = 2 is your answer.

~

Answer: yes

Step-by-step explanation: Wall would be 60 feet wide. 60 / 5 = 12.

Answer:

Yes

Step-by-step explanation:

Given :

1/2 in = 1 foot

re-written as : 1 in = 2 feet

THe blueprint is drawn to be 30 inches long

this is equivalent to 30 in x 2 feet/in = 60 feet long

With a minimum width of 5 feet per stall,

the number of stalls in 60 feet = 60 feet / 5 feet = 12 stalls

Hence there will be enough room for 12 stalls.

Answer:

Step-by-step explanation:

They want you to translate N^3 into another form that would still be correct.

log N^3 = 3 * log N is the answer that I think you want.  Try it it.

Suppose N = 6

Then N^3 = 6*6*6 = 216

log 216 = 2.3345

Now try it the other way.

3*log(6) =  3*0.7782

3*log(6) = 2.3345

Same answer as before.

Answer: (√2 - √6)/4

Step-by-step explanation:

I am going to use the sum formula: sin(A + B) = sin A cos B  +  cos A sin B

Let's say A = 135° and B = 30°

sin(135° + 30°) = sin(135°) * cos(30°) + cos (135°) * sin(30°)

                       = (√2)/2 * 1/2 + (-√2)/2 * (√3)/2

                       = (√2)/4 + (-√6)/4

                       = (√2 - √6)/4

The volume of the rectangular prism is length x width x height:

Volume = 1 1/2 x 1/2 x 3/4 = 9/16 cubic units.

The volume of cube is length^3 = 1/4^3 = 1/64

Divide the volume of the rectangular prism by the volume of the cube:

Number of cubes = 9/16 / 1/64 = 36

The answer is 36

ANSWER

A. Directrix y=-5, focus; (-2,6)

EXPLANATION

Answer:

True

Step-by-step explanation:

Based on Angle-Angle-Side, you would have two congruent triangles and those two sides are equal/congruent.

It is true, from the given information only we can say that AD = CD.

In geometry, two figures or objects are congruent if their shape and size are same.

If two angles and a side which does not come between these two angles is congruent with two angles and a side which does not come between these two of another triangle, then the triangles are said to be congruent by AAS criterion.

In the given question

∠ABD = ∠CBD  ( Given)

∠BAD = ∠BCD   (Right angles)

    BD = DB        (Common side of both triangles)

Δ ABD ≅ Δ CBD (AAS criterion)

The two triangles are congruent hence AD = CD.

Learn more about congruency on:

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The correlation coefficient 'r' equals 0 indicates that there is no linear relationship between two variables. However, there could be a non-linear relationship present that is not captured by 'r'. Therefore, one should also consider other statistical tests or data visualization methods to fully understand the relationship between variables.

When a correlation coefficient, or 'r', equals 0, it conveys that there is no linear correlation between the two observed variables. However, this does not necessarily mean that the two variables are entirely unassociated. The correct answer to the student's question is B: No, because while there is no linear correlation, there may be a relationship that is not linear.

This means that in the context of the problem, just because 'r' equals 0 between student's body temperature and head circumference, it doesn't conclude there is no relationship between these two variables. There could be a non-linear or curve relationship present, which cannot be determined by the correlation coefficient.

Remember, the correlation coefficient 'r' only measures the strength and direction of a linear relationship between two variables. It doesn't help in determining non-linear relationships. Therefore, it's important to also consider other statistical tests or visual data assessment methods when analyzing associations between variables.

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Answer:

(- 9, 4)

Step-by-step explanation:

A(3, 4) is 1 unit to the right of x = 2

Thus it's reflection will be 1 unit to the left of x = 2, that is

A(3, 4 ) → A'(1, 4) ← y- coordinate remains unchanged

--------------------------------------------------------------------

A'(1, 4 ) is 5 units to the right of x = - 4

Thus it's reflection will be 5 units to the left of x = - 4

A'(1, 4) → A''(- 9, 4 )

Under the 2 parallel reflections

A(3, 4) → A''(- 9, 4 )

Final answer:

To determine how many miles Carlos drove, we subtract the one-time rental fee from the total cost and then divide by the per-mile charge, resulting in Carlos having driven 88 miles.

Explanation:

To find out how many miles Carlos drove the rental car, we need to use the information about the total cost and the cost structure provided by the rental company. The total cost includes a one-time fee and a charge per mile driven. We can set up an equation to represent this situation. Let m represent the number of miles driven.

The equation based on the given costs would be:
20 + 0.50m = 64

Now, solve for m:

m = 88

Carlos drove 88 miles with the rental car.

Answer:

  least to greatest: {61, 61, 61, 178, 179}

Step-by-step explanation:

If the third-largest angle is 61°, the smallest three angles cannot be larger than 183°. Since the total of all angles must be 540°, and the total of the largest two cannot be greater than 179°×2 = 358°, the sum of the smallest three must be at least 540° -358° = 182°.

So, the possible sets of angles with the smallest 3 totaling 182° or 183° are (in degrees) ...

  {60, 61, 61, 179, 179} . . . . two modes

  (61, 61, 61, 178, 179} . . . . . one mode -- the set you're looking for

Answer:

61,61,61,178,179

Step-by-step explanation:

your welcome. :)

Answer:

Step-by-step explanation:

As with any equation involving fractions, you can multiply the equation by the least common denominator to eliminate fractions. Then solve in the usual way.

c) 1/a +b = c

  1 +ab = ac . . . . multiply by a

  1 = ac -ab . . . . subtract ab

  1 = a(c -b) . . . . . factor out a

  1/(c -b) = a . . . . divide by the coefficient of a

__

d) (a-b)/(b-a) = 1

  a -b = b -a . . . . . multiply by b-a

 2a = 2b . . . . . . . . add a+b

  a = b . . . . . . . . . . divide by the coefficient of a

Please be aware that this makes the original equation become 0/0 = 1. This is why a=b is not an allowed condition for this equation. As written, it reduces to -1 = 1, which is false. One could say there is no solution.

__

f) bc +ac = ab . . . . . multiply by abc

  bc = ab -ac . . . . . . subtract ac

  bc = a(b -c) . . . . . . factor out a

  bc/(b -c) = a . . . . . . divide by the coefficient of a

Answer:

1/x

Step-by-step explanation:

1/x is rational because the x is in the denominator of the fraction.  x/2 could be rewritten as (1/2)x, which is linear.

Answer:

  $2502.60

Step-by-step explanation:

The formula for the amount of an annuity due is ...

  A = P(1 +r/n)((1 +r/n)^(nt) -1)/(r/n)

where P is the monthly payment (100), r is the annual interest rate (.04), n is the number of compoundings per year (12), and t is the number of years (2). Given these numbers, the formula evaluates to ...

  A = $100(1.00333333)(1.00333333^24 -1)/0.00333333

  = $100(301)(0.08314296)

  = $2502.60

_____

This value is confirmed by a financial calculator. The given answer choices all appear to be incorrect. The closest one corresponds to an annual interest rate (APR) of 4.286%, not 4%.

Answer:

[tex]x+2=\pm2[/tex]

Step-by-step explanation:

He started with [tex](x+2)^2-9=-5[/tex].

He add 9 to both sides and the resulting equation was

[tex](x+2)^2=4[/tex]

Next, he took the square root of each side.

The resulting equation of this step is:

[tex](x+2)=\pm \sqrt{4}[/tex]

[tex]x+2=\pm2[/tex]

The required equation is:

[tex]x+2=\pm2[/tex]

Answer:x + 2 = ±2

Step-by-step explanation:

on edge

Answer:

B.  

Step-by-step explanation:

The parabola opens to the right since the focus is to the right of the vertex.  So the square part will definitely contain a y.  By elimination the answers can't be A or C.  The vertex is (2,3) so the answer is B.

Longer answer:

formula to use is (y-k)^2=4p(x-h) where the vertex is (h,k)

So (2,3) is our vertex so enter it in giving

(y-3)^2=4p(x-2)

p is 5 since 2 and 7 are 5 units apart

p is positive because again focus is right of vertex

the answer is

(y-3)^2=20(x-2)

Answer:

B

Step-by-step explanation:

Substitute a point in the equation:

(2,3)

(3 - 3)^2 = 20(2 - 2)

(3-3)^2 = 0

Which is True

You could also use y-y1=m(x-x1)

Answer:

[tex]\dfrac{72}{19}[/tex]

Step-by-step explanation:

Consider triangle ABC. Segment AX is angle A bisector. Its length can be calculated using formula

[tex]AX^2=\dfrac{AB\cdot AC}{(AB+AC)^2}\cdot ((AB+AC)^2-BC^2)[/tex]

Hence,

[tex]AX^2=\dfrac{9\cdot 10}{(9+10)^2}\cdot ((9+10)^2-17^2)=\dfrac{90}{361}\cdot (361-289)=\dfrac{90}{361}\cdot 72=\dfrac{6480}{361}[/tex]

By the angle bisector theorem,

[tex]\dfrac{AB}{AC}=\dfrac{BX}{XC}[/tex]

So,

[tex]\dfrac{9}{10}=\dfrac{BX}{17-BX}\Rightarrow 153-9BX=10BX\\ \\19BX=153\\ \\BX=\dfrac{153}{19}[/tex]

and

[tex]XC=17-\dfrac{153}{19}=\dfrac{170}{19}[/tex]

By the Pythagorean theorem for the right triangles AXY and CXY:

[tex]AX^2=AY^2+XY^2\\ \\XC^2=XY^2+CY^2[/tex]

Thus,

[tex]\dfrac{6480}{361}=XY^2+AY^2\\ \\\left(\dfrac{170}{19}\right)^2=XY^2+(10-AY)^2[/tex]

Subtract from the second equation the first one:

[tex]\dfrac{28900}{361}-\dfrac{6480}{361}=(10-AY)^2-AY^2\\ \\\dfrac{22420}{361}=100-20AY+AY^2-AY^2\\ \\\dfrac{1180}{19}=100-20AY\\ \\20AY=100-\dfrac{1180}{19}=\dfrac{1900-1180}{19}=\dfrac{720}{19}\\ \\AY=\dfrac{36}{19}[/tex]

Hence,

[tex]XY^2=\dfrac{6480}{361}-\left(\dfrac{36}{19}\right)^2=\dfrac{6480-1296}{361}=\dfrac{5184}{361}\\ \\XY=\dfrac{72}{19}[/tex]

Answer:

Step-by-step explanation:

Even though I have been teaching calculus and precalc for several years now, my mind automatically wants to think in degrees as opposed to radians.  So I converted the angle from radians to degrees to get 315.  This angle lies in QIV.  The reference angle is a 45 degree angle, since 360 - 315 = 45.  This is a 45 degree angle, but if you consider direction, measuring clockwise gives you a negative angle.  So it could be that the reference angle needs to be identified as -45 degrees.  It depends upon what lesson you are dealing with.  Regardless, because this is a 45-45-90 right triangle, both the legs measure the same length (because of the Isosceles Triangle Theorem), which is 1.  Therefore, if the angle is 45 degrees, then the tangent of it is 1/1 = 1.

Answer:

y=1/10x +10

Step-by-step explanation:

when we replace the x in this equation with numbers representing x in the points given, we are going to end up with the points that represents y in the question.

Answer:

C. [tex]y=\frac{x}{10} +10[/tex]

Step-by-step explanation:

Here we are given two points from which the line passes through . hence we use the two point form to evaluate the equation of line.

The two points are

(0,10) and (10,11)

the two point formula is

[tex]\frac{y-y1}{x-x1} = \frac{y2-y1}{x2-x1}[/tex]

Here x1=0, x2=10, y1=10, y2=11

Now we keep these values in the two point form formula given above

[tex]\frac{y-10}{x-0} = \frac{11-10}{10-0}\\\frac{y-10}{x} = \frac{1}{10}\\y-10=\frac{x}{10}\\y=\frac{x}{10}+10[/tex]

Hence our third option is correct.