Solve the problem.A certain radioactive isotope has a half-life of approximately 1300 years. How many years to the nearest year would be required for a given amount of this isotope to decay to 25% of that amount?
A. 975 yr
B. 2575 yr
C. 2600 yr
D. 540 yr
Answer: C
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Simplify the expression.18log39
A. 
B. 2
C. 36
D. 18
Determine whether the relation represents a function. If it is a function, state the domain and range.{(-2, 6), (-1, 3), (0, 2), (1, 3), (3, 11)}
A. function domain: {-2, -1, 0, 1, 3} range: {6, 3, 2, 11} B. function domain: {6, 3, 2, 11} range: {-2, -1, 0, 1, 3} C. not a function
Choose the most reasonable metric length unit. Choose from km, m, cm, and mm.The book is 21 
long.
A. km B. cm C. m D. mm
Solve the problem.For the following table of data, a.Draw a scatterplot.b.Calculate the correlation coefficient.c.Calculate the least squares line and graph it on the scatterplot.d.Predict the y-value when x is 17.
?
A. a.
b. 0.950
c. Y = 1.7x + 8.5
d. 37.4
B. a.
b. 0.903
c. Y = 2x + 6.5
d. 40.5
C. a.
b. 0.950
c. Y = 1.7x + 7.5
d. 36.4
D. a.
b. 0.950
c. Y = 1.7x
d. 28.9