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. 234 years
B. 813 years
C. 750 years
D. 1500 years
Answer: B
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Solve graphically. Round solutions to three decimal places, where appropriate.5x2 - 32x + 11 = 0
A. 0.365, 6.035 B. -8.669, -2.998 C. -7.169, -1.498 D. 0.865, 6.535
Describe the level surfaces for the given function.f(x, y, z) = 7x2 + 3y2 + 5z2 - 6
A. Ellipsoids B. Hyperboloids of two sheets C. Hyperbolic Paraboloids D. Hyperboloids of one sheet
Rewrite the statement using the if...then connective. Rearrange the wording or words as necessary.I'll leave when he arrives.
A. If I leave, then he will leave. B. If he arrives, then I'll leave. C. If I will leave, then he'll arrive. D. I'll leave when he arrives.
Determine ? in decimal degrees, 0° ? ? ? 90°. Round results to an appropriate number of significant digits.csc ? = 4.16
A. 13.9° B. 13.90° C. 13.30° D. 13.3°