If the line passing through the points (1, a) and (3, - 2) is parallel to the line passing through the points (3, 7) and (- 5, a + 6) , what is the value of a?
a. a = - 3
b. a = 5
c. a = - 5
d. a = 3
a. a = - 3
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Rewrite the expression without using negative exponents. (Assume all variables represent nonzero real numbers.)
A. 
B. x7y8
C. 
D. xy-15
Solve the problem.A biology experiment required pouring 
gallon of nutrient solution and 
gallon of pure water into a tank. At the end of the experiment, 
gallon of fluid had evaporated. How much fluid remained in the tank?
A. 
gallons
B. 
gallon
C. 
gallon
D. 
gallon(s)
Simplify the fraction.
If the fraction is undefined, answer undefined.
What will be an ideal response?