The following table shows the amount remaining, in grams, of a radioactive substance after t years.
05101520
500429.37368.71316.63271.9?
A. Calculate the average rate of change in amount of radioactive substance from 
to 
. (Be sure to get the sign right.)B. Explain in practical terms the meaning of the number you calculated in part A.C. Use your answer from part A to estimate the amount remaining after 13 years.D. What is the limiting value of amount remaining of this (or any other) radioactive substance?
What will be an ideal response?
A. -10.42 grams per year?B. From year 10 to year 15 , on average the amount of the radioactive substance remaining decreased by 10.42 grams each year.?C. 337.45 grams?D. 0
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Fill in the blank with one of the words or phrases listed below.
A symbol used to represent a number is called a 
.
A. variable B. base C. set D. solution
Write as a percent. 0.43
A. 0.043% B. 4.3% C. 430% D. 43%
Factor as completely as possible. If unfactorable, indicate that the polynomial is prime.-7x2 + 36xy - 5y2
A. -(7x - y)(x - 5y) B. (7x - y)(x - 5y) C. -(7x + y)(x + 5y) D. -(x - y)(7x - 5y)
Determine whether or not the function is one-to-one.
A. No B. Yes