# Multiple choice questions

• Nov 23rd 2009, 11:15 AM
cspan1986
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
• Nov 23rd 2009, 11:37 AM
apcalculus
Quote:

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!