3 years ago

A package of 7 erasers cost $0.42. At this rate, how much would 84 erasers cost, in dollars and cents?

Mathematics

1 answer:

Luda [366]3 years ago

4 0

Answer:

35,28

Step-by-step explanation:

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Two neighbors, wilma and betty, each have a swimming pool. both wilma's and betty's pools hold 9900 gallons of water. if wilma's

s2008m [1.1K]

To solve this problem we will start by calculating time needed for each of them to fill the pool.

We have formula:
Volume = rate * time
Or
time = volume / rate

Wilma:
time = 9900 / 900
time = 11h

Betty:
time = 9900 / 500
time = 19.8h

Now we substract these two numbers:
time_difference = 19.8 - 11 = 8.8h

Betty needs 8.8 hours more than Wilma to fill the pool.

3 0

3 years ago

If I equals PRT which equation is equivalent to T

snow_lady [41]

I = P · R · T
Divide both sides by P·R
I/(P·R) = T

Answer: $\frac{I}{PR} = T$