Simplify the expression by performing the indicated operations.
? 
+ 
? 
A. 84
B. 19
C. 10
D. 11
Answer: B
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Solve the problem.A new car dealership sold 270 cars in 2010, and sales are increasing by about 58 cars per year. Let s be the number of cars sold in the year that is t years since 2010. Find an equation for a linear model to describe this situation. Then solve that equation for t.
A. t = 
B. t = 
C. t = 
D. t = 
Use a graphing calculator to solve the system.4x + y = 16 x + 3y = -7
A. {(5, -4)} B. {(5, 4)} C. {(3, 4)} D. {(-5, -4)}
Find the mean for the list of numbers.Ages of patients (in years) in a clinic: 18, 4, 25, 18Round answer to the nearest whole number if necessary.
A. 4 year(s) B. 18 years C. 16 years D. 15 years
Solve the problem.A projectile is fired from a cliff 300 feet above the water at an inclination of 45° to the horizontal, with a muzzle velocity of 300 feet per second. The height h of the projectile above the water is given by 
where x is the horizontal distance of the projectile from the base of the cliff. How far from the base of the cliff is the height of the projectile a maximum?
A. 703.13 ft B. 1003.13 ft C. 2409.38 ft D. 1406.25 ft