3 years ago

If a number a is chosen at random from the set

Mathematics

1 answer:

Paraphin [41]3 years ago

7 0

Answer:

D. 3/19

Step-by-step explanation:

12/1 = 12

12/2 = 6

12/3 = 4

These are the only ones that make the equation true.

There are also only 19 numbers because they need to be less than 20 like the question indicated. Therefore, the answer is D.

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The interest rate r required to increase your investment p to the amount a in t years is found by . Find the interest rate r for

Dahasolnce [82]

Answer:

The interest rate was of 0.1173 = 11.73%.

Step-by-step explanation:

This is a simple interest problem.

The simple interest formula is given by:

$E = P*I*t$

In which E is the amount of interest earned, P is the principal(the initial amount of money), I is the interest rate(yearly, as a decimal) and t is the time.

After t years, the total amount of money is:

$A = E + P$

In this problem, we have that:

$A = 10000, P = 8100, t = 2$

$A = E + P$

$10000 = E + 8100$

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$1900 = 8100*I*2$

$I = \frac{1900}{8100*2}$

$I = 0.1173$

The interest rate was of 0.1173 = 11.73%.

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