Solve.A particular substance decays in such a way that it loses half its weight each day. How much of the substance is left after 9 days if it starts out at 64 grams?
A. 4 grams
B. 
gram
C. 8 grams
D. 
gram
Answer: B
Mathematics
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Divide. Write a mixed numeral for the answer.4
÷ 4
A. 1
B. 1
C. 2
D. 1
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Change to a decimal.80%
A. 0.69 B. 0.08 C. 8 D. 0.8
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For 
Differentiate.
Mathematics
Use the given information to answer the question.The height of a baseball that is thrown from ground level with an initial velocity of 72 feet per second can be modeled by h = -16t2 + 72t. Use this model to find the height of the ball after 2.5 seconds.
A. 280 ft B. 80 ft C. 100 ft D. -80 ft
Mathematics