Use a calculator to give the value to the nearest degree.? = sin-1(0.6561)
A. 41°
B. 39°
C. 44°
D. -41°
Answer: A
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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 88% of the isotope left?
A. 639 years B. 600 years C. 241 years D. 1200 years
Use ratios or conversion factors to convert the measures of time.Convert 168 hours to days.
A. 56 days B. 84 days C. 7 days D. 49 days
Solve the problem.Find the acute angle ? (in degrees) that satisfies the equation ? = sin-1 
.
A. 45° B. 120° C. 135° D. 60°
A formula is given, along with values for all but one of the variables in the formula. Find the value of the variable that is not given.V = 
Bh for B = 27, h = 4
A. V = 36 B. V = 9 C. V = 40 D. V = 144