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scZoUnD [109]
3 years ago
9

the number of hours,h, it takes to wash c numbers of cars at a school fundraiser is inversely proportional to the number of stud

ents,s, needed to wash the cars. Write a equation to represent his relationship
Mathematics
1 answer:
Alex787 [66]3 years ago
3 0
\bf \qquad \qquad \textit{inverse proportional variation}
\\\\
\textit{\underline{y} varies inversely with \underline{x}}\qquad \qquad  y=\cfrac{k}{x}\impliedby 
\begin{array}{llll}
k=constant\ of\\
\qquad  variation
\end{array}\\\\
-------------------------------\\\\
\stackrel{\textit{\underline{h}ours to wash a car, is inversely proportional to \underline{s}tudents working on it}}{h=\cfrac{k}{s}}
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Rzqust [24]

Answer:

x = 19

Step-by-step explanation:

Trapezium area formula: \frac{a+b}{2} * h, where a & b are the two bases.

Now, if we plug in our known values, we can solve for the missing base.

\frac{5 + x}{2}  * 4 = 48

\frac{5 + x}{2} = 12\\\\5 + x = 24\\\\x = 19

3 0
3 years ago
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1) A plane averaged 412 miles per hour on a trip that
nevsk [136]
412 * 3.75 = 1545, The answer is 1545 miles
5 0
3 years ago
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MATH HELP
elena-s [515]

The equation of line perpendicular to given line is:

y = \frac{2}{3}x-1

Step-by-step explanation:

Given equation is:

3x+2y = -8

First of all, we have to find the slope of the given line

So,

3x+2y = -8\\2y = -3x-8\\

Dividing both sides by 2

\frac{2y}{2} = \frac{-3x-8}{2}\\y = \frac{-3x}{2} - \frac{8}{2}\\y  =-\frac{3}{2}x-4

As the equation is in slope-intercept form, the co-efficient of x will be the slope of the line

m_1 = -\frac{3}{2}

As we know that product of slopes of two perpendicular lines is -1

Let m-2 be the slope of line perpendicular to given line

m_1.m_2 = -1\\-\frac{3}{2} . m_2 = -1\\m_2 = -1 * -\frac{2}{3}\\m_2 = \frac{2}{3}

Slope-intercept form is:

y = m_2x+b

putting the value of the slope

y = \frac{2}{3}x+b

Putting the point (3,1) in the equation

1 = \frac{2}{3}(3) +b\\1 = 2 + b\\b = 1-2\\b = -1

Putting the value of b

y = \frac{2}{3}x-1

Hence,

The equation of line perpendicular to given line is:

y = \frac{2}{3}x-1

Keywords: Slope-intercept form, slope

Learn more about equation of line at:

  • brainly.com/question/750742
  • brainly.com/question/7419893

#LearnwithBrainly

8 0
3 years ago
Is the trinomial a perfect square? write yes or no. x^2+12x+36
Lapatulllka [165]

Answer:

no

Step-by-step explanation:

7 0
3 years ago
jenna's rectangular garden borders a wall. she buys 80 ft of fencing. what are the dimensions of the garden that will maximize i
FrozenT [24]

Answer:

The  dimensions are x =20 and y=20 of the garden that will maximize its area is 400

Step-by-step explanation:

Step 1:-

let 'x' be the length  and the 'y' be the width of the rectangle

given Jenna's buys 80ft of fencing of rectangle so the perimeter of the rectangle is    2(x +y) = 80

                         x + y =40

                               y = 40 -x

now the area of the rectangle A = length X width

                                                  A = x y

substitute 'y' value in above A = x (40 - x)

                                              A = 40 x - x^2 .....(1)

<u>Step :2</u>

now differentiating equation (1) with respective to 'x'

                                      \frac{dA}{dx} = 40 -2x     ........(2)

<u>Find the dimensions</u>

<u></u>\frac{dA}{dx} = 0<u></u>

40 - 2x =0

40 = 2x

x = 20

and y = 40 - x = 40 -20 =20

The dimensions are x =20 and y=20

length = 20 and breadth = 20

<u>Step 3</u>:-

we have to find maximum area

Again differentiating equation (2) with respective to 'x' we get

\frac{d^2A}{dx^2} = -2

Now the maximum area A =  x y at x =20 and y=20

                                        A = 20 X 20 = 400

                                         

<u>Conclusion</u>:-

The  dimensions are x =20 and y=20 of the garden that will maximize its area is 400

<u>verification</u>:-

The perimeter = 2(x +y) =80

                           2(20 +20) =80

                              2(40) =80

                              80 =80

8 0
3 years ago
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