suppose that y varies inversely with x, and y=0.2 when x=8. what is the equation for the inverse variation​

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:

  $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:

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.

if we take 45 as the 100%, what is 27 off of it in percentage?

[tex]\bf \begin{array}{ccll} amount&\%\\ \cline{1-2} 45&100\\ 27&x \end{array}\implies \cfrac{45}{27}=\cfrac{100}{x}\implies \cfrac{5}{3}=\cfrac{100}{x} \\\\\\ 5x=300\implies c=\cfrac{300}{5}\implies c=60[/tex]

Answer:

if we take 45 as the 100%, what is 27 off of it in percentage?

Step-by-step explanation:

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:

250d + 300

Step-by-step explanation:

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:

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:

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.

Answer: [tex]=528[/tex]

Step-by-step explanation:

You have this expression:

[tex]2(3x^3 + 2y^2)[/tex]

You already know that the value of the variable "x" is:

[tex]x=-2[/tex]

And the value of the variable "y" is:

[tex]y=12[/tex]

Therefore, you can substitute the value of the variable "x" and the value of the variable "y" into the expression.

Then you get:

 [tex]2(3(-2)^3 + 2(12)^2)=2(-24+288)=2(264)=528[/tex]

Answer:

528

Step-by-step explanation:

2(3х³ + 2у²)

Where x = -2 and y = 12 which means whenever you sees x, put -2 in replacement and y put 12

So we solve;

2(3x³ + 2y²), x = -2, y = 12

2[3(-2)³ + 2(12)²]

2[3(-8) + 2(144)]

2[-24 + 288]

open the bracket by multiplying by 2

-48 + 576

combine

528

ANSWER

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

EXPLANATION

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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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:

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:

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:

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:

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:

  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: (B) = 110.2

50*2.2046 = 110.23

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:

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.

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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:

Step-by-step explanation:

10-2= the number of cars that finished

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 )

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.

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:

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: (√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

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: