Multiply and simplify.
? 
A. - 
B. 
C. 
D. -12
Answer: A
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Solve the problem.A long strip of sheet metal 12 inches wide is to be made into a small trough by turning up two sides at right angles to the base. If the trough is to have maximum capacity, how many inches should be turned up on each side?
A. 6 in. B. 3 in. C. 5 in. D. 4 in.
Determine whether the number used is a cardinal or an ordinal number.The baby gained four ounces since his last check-up.
A. Ordinal B. Cardinal
Provide an appropriate response.One way to determine if two fractions are equivalent is to use 
.
A. simplification B. common factors C. equivalent terms D. the method of prime factors
Find the largest open intervals where the function is concave upward.f(x) = 
A. (0, ?), (-?, 0) B. (-?, 0) C. (-?, ?) D. (0, ?)