Write the phrase as an algebraic expression. Let x represent the unknown number.Twelve decreased by a number
A. 12 - x
B. 
C. x + 12
D. x - 12
Answer: A
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Perform the indicated operation.(x + 6)(x3 + 7x - 2)
A. x4 + 6x3 + 7x2 + 44x + 12 B. x4 + 6x3 + 7x2 + 40x - 12 C. x4 + 7x2 - 2x + 6 D. x3 + 13x2 + 40x - 12
Find the area of the triangle. Approximate values to the nearest tenth when appropriate.
A. 50 ft2 B. 160 ft2 C. 80 ft2 D. 40 ft2
Perform the indicated operation. Write the answer in scientific notation.
A. 2.19 × 1040 B. 1.25 × 10-44 C. 2.19 × 10-4 D. 1.25 × 10-2
Provide an appropriate response.If an object is dropped, the distance it falls after t seconds is given by d = 
gt2. A student is determining how long it would take an object to fall 75 feet on planet x having gravity 19 ft/sec2. The student determines the two solutions 
. Are both correct answers? Why or why not?
What will be an ideal response?