3 years ago

Raymond invested $3,500 and earned $257.25 in interest over 1 3/4 years. What was the rate?

1 answer:

8 0

4.2% annually. 257.25 is 7.25% of 3500. Then you take 7.35 divided by 7 because is 4/4 + 3/4 = 7/4 so you take 7.35/ 7 and it comes out to 1.05 and then you multiply that by 4 quarters of a year. So the answer is 4.2% annually (yearly)

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What is the exact area of a circle with a diameter of 20 cm?

Kisachek [45]

Hi there! The answer is 100πcm^2

The radius of a circle can be found by dividing the diameter by 2. In other words : the radius is half of the diameter.
Therefore, the radius of a circle with a diameter of 20 cm is 10 cm.

The exact area of a circle can be found using the following formula:
$a = \pi \times \: {r}^{2} \\ with \\ a = area \\ r = radius$

In order to find our answer, we need to plug in the data from the question.
$a = \pi \: \times {10}^{2} = 100\pi$

Hence, the answer is 100πcm^2.

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3 years ago

The graphs of the equations 4x - y = 6 and x + y = 4 intersect at

Mars2501 [29]

Solve by Substitution
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