Solve the problem.Amy travels 450 miles at a certain speed. If the car had gone 15 mph faster, the trip would have taken 1 hour less. Find Amy's speed.
A. 68 mph
B. 72 mph
C. 78 mph
D. 75 mph
Answer: D
Mathematics
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Find ? to four significant digits for 0 ? ? < 2?.cos ? = 0.2816
A. 1.285, 1.856 B. 1.285, 4.427 C. 1.285, 4.998 D. 0.2855, 3.427
Mathematics
Solve.
= 3
A. 
B. 18
C. 
D. 6
Mathematics
Identify the property illustrated by the expression.12 + (20 + 22) = (12 + 20) + 22
A. commutative property of addition B. distributive property C. identity element for addition D. associative property of addition
Mathematics
?Find the marginal revenue for producing x units. (The revenue is measured in dollars.)
?
?
A. ?
dollars
B. ??
dollars
C. ??50 dollars
D. ??
dollars
E. ???
dollars
Mathematics