Find the principal of interest!! random answers will be reported 1. Interest: $640
Rate: 4%
Time: 1 year
2. Interest: $2,016
Rate: 12%
Time: 3 years

4: $16,000

5: $4978.66

6: .086278 or 8.62%

Step-by-step explanation:

For the entirety of this problem I am going to assume that the interest is compounding annually

4: to find the interest earned in a period you have the following equation

(principle*(1+i)^n)-Principle

We can plug in the values we know

principle=p

(p*1.04)-p=640

This means that p=640/.04

p=16000

5: This is the same deal as the other one

2016=(p*(1.12)^3)-p

Solve this and get 1.404928p-p=2016

This means that .404928p=2016

Which means that p=4978.66

6: This one is slightly different but we can still use the same formula

720=4000((1+i)^2)-4000

We can add 4000 and then divide by 4000 to get

1.18=(1+i)^2

Take the square root of both sides and subtract 1 to solve for i

i= .086278 or 8.62%

2. angles qrt and qst both measures 156 degrees.

step-by-step explanation:  

we have been given a diagram of a circle and we are told that measure of arc qvt is 156 degrees.  

we can see from our given diagram that angle qrt and angle qst subtends to arc qvt.

since we know that angles subtended by the same arc at the circumference are always equal.

by angle subtended by same arc theorem, measure of angle qrt and angle qst will be equal to the measure of arc qvt.

therefore, angles qrt and qst both measures 156 degrees and 2nd statement is the correct choice.

a

step-by-step explanation: