Solve the problem.The parking lot at a shopping mall has 70 cars in it. 90% of the cars are four-door. How many cars are four-door?
A. 78 cars
B. 8 cars
C. 63 cars
D. 630 cars
Answer: C
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Solve the problem.Regrind, Inc. regrinds used typewriter platens. The cost per platen is $2.60. The fixed cost to run the grinding machine is $122 per day. If the company sells the reground platens for $4.60, how many must be reground daily to break even?
A. 40 platens B. 16 platens C. 61 platens D. 46 platens
Solve the problem.Suppose a projectile is launched from the origin into the first quadrant with an initial velocity v0 feet per second at an angle ? with the horizontal. If the only force acting on the projectile is the force of gravity (with acceleration, g = 32 ft/sec2), then the equation of motion is given by 
A golf ball is hit with an initial velocity of 47 ft/sec with an angle 
Write the equation of motion of the ball.
A. y = x tan (60°) - 
x2
B. y = 47 tan (60°) - 
(47)2.
C. y = x tan (60°) - 
x2
D. y = x tan (60°) - 
x2
Write the phrase as a variable expression. Use x for the unknown number.The difference of -5 and twice a number
A. -5 + 2x B. -5 - 2x C. 2(-5 - x) D. 2x + 5
Perform the indicated operation.2 lb 6 oz × 3
A. 6 lb 6 oz B. 5 lb 2 oz C. 7 lb 2 oz D. 6 lb 2 oz