Find the indicated mean. Find the mean of the 9th through the 51th terms inclusive of the sequence an = 5n + 45.
A. 390
B. 90
C. 300
D. 195
Answer: D
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Solve the problem.A certain radioactive isotope decays at a rate of 2% per 100 years. If t represents time in years and y represents the amount of the isotope left then the equation for the situation is 
In how many years will there be 85% of the isotope left?
A. 1,500 yr B. 813 yr C. 234 yr D. 750 yr
Factor the trinomial, or state that the trinomial is prime.7x2 - 44x + 12
A. (7x - 2)(x - 6) B. (7x - 2)(7x + 6) C. 7(x - 2)(x - 6) D. (7x + 6)(x - 2)
Find the center and radius of the circle.x2 + (y + 5)2 = 36
A. (-5, 0); 6 B. (0, -5); 36 C. (0, 5); 6 D. (0, -5); 6
Tell which set or sets the number belongs to: natural numbers, whole numbers, integers, rational numbers, irrational numbers, and real numbers.
A. rational, real B. real C. irrational, real D. whole, real