Evaluate the expression using the given values.
; x = 12, y = -5
A. 17
B. 13
C. 
D. 15
Answer: B
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Solve the formula for the indicated variable.
+ 
= c for b
A. b = 
B. b = ac - 
C. b = 
- a
D. b = 
Perform the operation and reduce to lowest terms.
× 
× 
A. 
B. 
C. 
D. 
The CB radio of a trucker covers the circular area shown in illustration. Find the equation of that circle, in general form.
?
?
; 
?
A. ?
B. ?
C. 
D. ?
E. ?
Assume a clear day and flat terrain in the nearby region. How far could you see, in miles, from the top of this building whose height is given?
Transamerica Pyramid, San Francisco, h = 853 feet
On Earth, the distance to the horizon is given by 
, where d is in miles to the horizon and h is in feet above sea level. Please round your answer to the nearest tenth.
A) 44.1 miles
B) 37.8 miles
C) 35.8 miles
D) 39.4 miles
E) 47.4 miles