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Blababa [14]
3 years ago
12

Find the constant of variation k for the inverse variation. Then write an equation for the inverse variation. y = 2.5 when x = 9

Mathematics
2 answers:
Ahat [919]3 years ago
7 0
1. k = 2<span>2.5</span><span>
2. xy=k
  

thats what i got</span>
attashe74 [19]3 years ago
7 0

the answer is

k = 22.5 xy= 22.5

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Kelly skated 4 laps in 86 seconds. Which of the following is an equivalent rate of skating?
ikadub [295]

Answer:

D: 10 laps in 215 seconds

Step-by-step explanation:

86/4 = 21.5 seconds per lap

I went through and multiplied each lap number by the time per lap and the last one, D is the right answer!

Have an amazing day!

Please rate and mark brainliest!

3 0
2 years ago
2. The path of a high diver is given by y = + (2x2 – 9x – 56), where y is the height of the diver
timofeeve [1]

Answer:

The diver will be 8 feet from the end of the board when he hits the water.

Step-by-step explanation:

The diver hits the water when y = 0.

To find the distance, we have to find the values of x when y = 0.

Solving a quadratic equation:

Given a second order polynomial expressed by the following equation:

ax^{2} + bx + c, a\neq0.

This polynomial has roots x_{1}, x_{2} such that ax^{2} + bx + c = (x - x_{1})*(x - x_{2}), given by the following formulas:

x_{1} = \frac{-b + \sqrt{\bigtriangleup}}{2*a}

x_{2} = \frac{-b - \sqrt{\bigtriangleup}}{2*a}

\bigtriangleup = b^{2} - 4ac

In this problem, we have that:

y = 2x^{2} - 9x - 56

2x^{2} - 9x - 56 = 0

So

a = 2, b = -9, c = -56

Then

\bigtriangleup = b^{2} - 4ac = (-9)^{2} - 4*2(-56) = 529

x_{1} = \frac{-(-9) + \sqrt{529}}{2*2} = 8

x_{2} = \frac{-(-9) - \sqrt{529}}{2*2} = -3.5

It is a horizontal distance, so the answer is a positive value.

The diver will be 8 feet from the end of the board when he hits the water.

7 0
3 years ago
Translate this phrase into an algebraic expression.
Alekssandra [29.7K]
4/x+10

(4 divided by x + 10)
7 0
3 years ago
|4-24x|=52 absolute value
Verdich [7]
|4-24x|=52
24x=56
2.333~ is your answer
8 0
3 years ago
Simplify:<br> 9x/2 - 4x - 3 = ?
icang [17]

Answer: Um, I think is \frac{x}{2-3}.

Step-by-step explanation:

4 0
2 years ago
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