Add or subtract. Express the answer as a mixed number.19
+ 20
A. 40
B. 19
C. 38
D. 39
Answer: D
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Multiply and simplify.
? 
A. 
B. 
C. 
D. 
Solve.As Sunee improves her algebra skills, she takes 0.9 times as long to complete each homework assignment as she took to complete the preceeding assignment. If it took her 50 minutes to complete her first assignment, find how long it took her to complete the fifth assignment. Find the total time she took to complete her first five homework assignments. (Round to the nearest minute.)
A. 30 min; 205 min B. 33 min; 205 min C. 33 min; 172 min D. 30 min; 172 min
Solve the problem.Suppose that a demand function is given by 
where q is the demand for a product and p is the price per unit in dollars. Find the rate of change in the demand for the product per unit change in price.
A. 
= 
B. 
= 
C. 
= 
D. 
= 
Graph the equation in the rectangular coordinate system.y = -5
A. 
B. 
C. 
D. 