# Math Help - Multiple choice questions

1. ## Multiple choice questions

2. Find the amount accumulated after investing a principal P for t years at an interest rate r. (use r as a decimal-not a %)

P=1,000 t=7 r=9% compounded annually (k=1)

A) $1677.10 B)$1992.56
C) $828.04 D)$1828.04

3. Find the amount accumulated after investing a principal P for t years at an interest rate r. (use r as a decimal-not a %)

P=840 t=5 r=1% compounded continuously

A) $1025.98 B)$124,667.05
C) $1274.19 D)$883.07

4. Suppose the amount of a radioactive element remaining in a sample of 100 milligrams after x years can be described by A(x)=100e^-0.01123x. How much is remaining after 103 years? Round the answer to the nearest hundredth of a milligram.

A) 115.67 mg
B) 0.31 mg
C) 31.45 mg
D) 317.94 mg

2. Originally Posted by cspan1986
2. Find the amount accumulated after investing a principal P for t years at an interest rate r. (use r as a decimal-not a %)

P=1,000 t=7 r=9% compounded annually (k=1)

A) $1677.10 B)$1992.56
C) $828.04 D)$1828.04

3. Find the amount accumulated after investing a principal P for t years at an interest rate r. (use r as a decimal-not a %)

P=840 t=5 r=1% compounded continuously

A) $1025.98 B)$124,667.05
C) $1274.19 D)$883.07

4. Suppose the amount of a radioactive element remaining in a sample of 100 milligrams after x years can be described by A(x)=100e^-0.01123x. How much is remaining after 103 years? Round the answer to the nearest hundredth of a milligram.

A) 115.67 mg
B) 0.31 mg
C) 31.45 mg
D) 317.94 mg
For 2 and 3 you should have some formula you can plug into.

For 4, plug in x=103 to find the amount remaining.
Good luck!