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AysviL [449]
2 years ago
7

If y varies inversely with x and y =5 when x=20 find x when y = -4​

Mathematics
1 answer:
sweet-ann [11.9K]2 years ago
7 0

Answer:

x=-25

Step-by-step explanation:

Inverse variation

xy =k

We know x and y

20*5 =k

100 =k

So the formula is

x y = 100

We know y = -4

x (-4) = 100

Divide each side by -4

-4x/-4 = 100/-4

x = -25

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A public swimming pool that holds 45,000 gallons of water is going to be drained for maintenance at a rate of 100 gallons per mi
crimeas [40]

Answer:

450 minutes

Step-by-step explanation:

Given

w = 45000 - 100t

Required

Determine how long it'll take to empty the pool

Being empty means there's no water in the pool.

So, we have to set w to 0 to get the value of t

i.e w = 0

Substitute 0 for w in w = 45000 - 100t

0 = 45000 - 100t

Collect Like Terms

100t = 45000

Divide through by 100.

t = 450

Hence, it'll take 450 minutes to empty the pool

8 0
2 years ago
Question 1 (Essay Worth 10 points)
zysi [14]

$394.51 is future value of money after 2 years.

What future value means?

  • A current asset's future value (FV), which is based on an estimated rate of growth, is its value at a later time.
  • Investors and financial planners use the future value to project how much an investment made now will be worth in the future.

The method that results in more money after 2 years is Peggy's investment.

Which method results in more money in 2 years?

The formula for calculating the future value of an investment:

FV = P (1 + r)^nm

FV = Future value

P = Present value

R = interest rate

m = number of compounding

N = number of years

Future value of Larry's investment: $350 x [1 + (0.04/4)]^(4 x 2) = $379

Future value of Peggy's investment: $350 x [1 + (0.06/12)]^(12 x 2) = $394.51

Learn more about future value

brainly.com/question/14860893

#SPJ13

4 0
1 year ago
Vani signed up for a streaming music service that costs $12 per month. The service
ollegr [7]

Answer:

49.5 dollars first part and y=12+1.25x second part

Step-by-step explanation:

7 0
2 years ago
F(x) = 2(2)2 – 3(2) + 7<br> = 2(4) – 3(2) + 7
hammer [34]

Answer:

9

Step-by-step explanation:

2(2)2 -3(2) + 7

2(4) - 6 + 7

8 - 6 + 7

2 + 7

9

5 0
3 years ago
dvd cases are sold in packages of 9 padded mailing envelopes are sold in packets of 3 what is the least number of cases and enve
Lostsunrise [7]
Im lost at this sorry, hope sum1 helps you out on this tho!
7 0
3 years ago
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