Use the rules for exponents to rewrite the expression and then evaluate the new expression. 
A. 0
B. -12
C. 1
D. -4
Answer: C
Mathematics
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Find the number of gallons of sulfuric acid in 90 gallons of solution in a tank, if the percent of sulfuric acid is 50%.
A. 45 gal B. 4.5 gal C. 9 gal D. 18 gal E. 90 gal
Mathematics
Construct a truth table for the statement.q ? ~p
A. 
| T | T | F |
F T T
F F T
B.
| T | T | T |
F T F
F F F
C.
| T | T | F |
F T T
F F T
D.
| T | T | T |
F T T
F F T
Mathematics
Find the length of the third side of the right triangle. Assume that c represents the length of the hypotenuse. Give an exact answer and, if appropriate, an approximation to three decimal places.b = 20, c = 25
A. a = 5 B. a = 15 C. a = 225 D. a = 45
Mathematics
Graph the ellipse and locate the foci.
+ 
= 1 Round to the nearest tenth if necessary. 
A. foci (1.4, 0) and (0, -1.4)
B. foci (0, 1.4) and (0, -1.4)
C. foci (0, 1.4) and (0, -1.4)
D. foci (1.5, 0) and (0, -1.5)
Mathematics