Solve the problem. Round to the nearest tenth, if necessary.If an object is propelled upward from ground level with an initial velocity of 34 feet per second, its height h in feet t seconds later is given by the equation 
After how many seconds does the object hit the ground?
A. 4.3
B. .5
C. 2.1
D. 1.1
Answer: C
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Use identities to simplify the expression.
A. cos2 x B. sin2 x C. tan x sec x D. cot x csc x
Solve.At Allied Electronics, production has begun on the X-15 Computer Chip. The total cost function is given by 
and the total profit function is given by 
where x represents the number of boxes of computer chips produced. The total revenue function, R(x), is such that 
Find R(x).
A. R(x) = 55x - 0.3x2 B. R(x) = 53x + 0.3x2 C. R(x) = 52x - 0.6x2 D. R(x) = 53x - 0.3x2
Multiply and simplify any radicals in your answer. Assume that all variables represent positive real numbers.-9
(2
+ 4
+ 
)
A. -72y
B. -17
+ 4
C. -72xy
D. -18
- 36x - 9x
Express the exercise as a system of linear equations, then find the solution. Use a calculator where appropriate.Ellen wishes to mix candy worth $1.42 per pound with candy worth $3.35 per pound to form 31 pounds of a mixture worth $2.60 per pound. How many pounds of the more expensive candy should she use? Round your answer to the nearest pound.
A. 19 lb B. 24 lb C. 12 lb D. 14 lb