Solve the given equation by finding the unknown value.45 + 21 = ?
A. 75
B. 56
C. 66
D. 64
Answer: C
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Solve the problem.Newton's Law of Cooling states that if a body with temperature T1 is placed in surroundings with temperature T0 different from T1, then the body will either cool or warm to temperature T(t) after time t, in minutes, where 
A cup of coffee with temperature 105°F is placed in a freezer with temperature 0°F. After 7 minutes, the temperature of the coffee is 61.2°F. What will its temperature be 20 minutes after it is placed in the freezer? Round your answer to the nearest degree.
A. 19°F B. 18°F C. 21°F D. 23°F
An investment of $7,000 earns 6% interest, compounded continuously. What will the investment be worth in 8 years?
A. $11,293.52 B. $11,313.71 C. $11,309.36 D. $11,312.52 E. $11,301.86
Write an equation for the graph.
A. y = -1 B. x = y - 1 C. y = x - 1 D. x = -1
Write the fraction in simplest form.
A. 
B. 
C. 
D. 