The size of two matrices is given. Find the size of the product AB and the product BA, if the products exist.A is 2 × 2, B is 2 × 2.
A. AB is 2 × 4, BA is 2 × 4.
B. AB is 1 × 1, BA is 1 × 1.
C. AB is 2 × 2, BA is 2 × 2.
D. AB is 4 × 2, BA is 4 × 2.
Answer: C
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Solve.The amount of paint needed to cover the walls of a room varies jointly as the perimeter of the room and the height of the wall. If a room with a perimeter of 35 feet and 
walls requires 
of paint, find the amount of paint needed to cover the walls of a room with a perimeter of 40 feet and 10-foot walls.
A. 400 quarts B. 8 quarts C. 4 quarts D. 40 quarts
Provide an appropriate response.What is the percent efficiency (E) of an engine if the input (I) is 20,000 calories and the output (P) is 6,200 calories? Use the formula: E = 
.
A. 0.69 B. 0.45 C. 2.23 D. 1.45
The graph of a function is given. Decide whether it is even, odd, or neither.
A. even B. odd C. neither
Find the average rate of change for the function between the given values.f(x) = 
; from 1 to 5
A. -2
B. - 
C. -28
D. 