What is the miles travel in 5 hours at a rate of 189 miles in 3 hours

Mathematics

2 answers:

11111nata11111 [884]4 years ago

4 0

315 miles in 5 hours.

MissTica4 years ago

3 0

Ratio=distance / time ⇒ distance=rate x time
Data:
ratio=189 miles/3 hours=63 miles/hours
Time=5 hours

distance=(63 miles/hours)(5 hours)=315 miles.

Answer: 315 miles

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Answer:

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The exact doubling time of this amount is 8.04 years.

Step-by-step explanation:

Sometimes, the compound interest formula is quite complex to be solved, so the result can be estimated by the rule of 72.

By the rule of 72, we have that the doubling time D is given by:

$D = \frac{72}{Interest Rate}$

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In our exercise, the interest rate is 9%. So, by the rule of 72:

$D = \frac{72}{9} = 8$ .

According to the rule of 72, the doubling time for this interest rate is 8 years.

Exact answer:

The exact answer is going to be found using the compound interest formula.

$A = P(1 + \frac{r}{n})^{nt}$

In which A is the amount of money, P is the principal(the initial sum of money), r is the interest rate(as a decimal value), n is the number of times that interest is compounded per unit t and t is the time the money is invested or borrowed for.

So, for this exercise, we have:

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is double the initial amount, double the principal.

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