Solve the problem.The time t in years for an amount increasing at a rate r (in decimal form) to double is given by 
This is called "doubling time." How long will it take for prices in the economy to double at a 7% annual inflation rate? Round to the nearest year.
A. 9 yr
B. 23 yr
C. 10 yr
D. 16 yr
Answer: C
Mathematics
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Multiply and simplify. Assume variables do not cause any denominators to equal 0.
? 
A. 
B. 
C. 
D. 
Mathematics
Determine if the sequence is geometric. If the sequence is geometric, find the common ratio.4, -16, 64, -256, 1024, . . .
A. no
B. yes, 16
C. yes, -4
D. yes, - 
Mathematics
Translate the phrase to an algebraic expression. Let x represent the unknown number.The product of 4 and a number
A. 4 + x
B. 4 - x
C. 4x
D. 
Mathematics
Factor the polynomial completely.6z2 - 21z - 12
A. 3(2z - 1)(z + 4) B. 3(2z + 1)(z - 4) C. 3(2z - 4)(z + 1) D. (6z - 3)(z + 4)
Mathematics