Solve the problem.Strontium 90 decays at a constant rate of 2.44% per year. Therefore, the equation for the amount P of strontium 90 after t years is P = P0 e-0.0244t. How long will it take for 15 grams of strontium to decay to 5 grams? Round answer to 2 decimal places.
A. 40.50 years
B. 450.25 years
C. 4.50 years
D. 45.03 years.
Answer: D
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Solve problems using a calculator.The Passive House Standard is a strict building code used as a state guideline for building energy-efficient homes. The total primary energy consumption of a building following this code must not be more than 19,020 Btu per square foot per year. What would this annual maximum be for a 4500-square-foot house?
A. 85,540,000 Btu per year B. 85,590,000 Btu per year C. 85,570,000 Btu per year D. 85,530,000 Btu per year
Solve the equation by the method of your choice. Simplify irrational solutions, if possible.3x2 - 5x - 8 = 0
A. 
B. 
C. 
D. 
Solve.A projectile is thrown upward so that its distance, in feet, above the ground after t seconds is 
What is its maximum height?
A. 158,625 ft B. 10,125 ft C. 3375 ft D. 6525 ft
Solve the problem.Your friend's degree requires 64 credits. She has already completed six 5-credit courses and five 3-credit courses. What fraction of the required credits has she completed?
A. 
B. 
C. 
D. 