Solve the problem.How long will it take a sample of radioactive substance to decay to half of its original amount, if it decays according to the function A(t) = 250e-.223t, where t is the time in years? Round your answer to the nearest hundredth year.
A. 3.11 yr
B. 24.76 yr
C. 55.75 yr
D. 27.87 yr
Answer: A
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Type A grain containing 15.00% protein is mixed with type B grain containing 26% protein to make 1252 pounds of feed. The resulting mixture is to contain 23% protein. A: If we use ?a pounds of type A grain and ?b pounds of type B grain, write a system of two equations that determine the amounts of each that go into the mixture. Round your answers to two decimal places, if necessary.B: How much grain of each type goes into the mixture? Round your answers to two decimal places, if necessary.
What will be an ideal response?
Solve the problem.A size 8 dress in Country C is size 56 in Country D. A function that converts dress sizes in Country C to those in Country D is 
Find the inverse function.
A. f-1(x) = 
B. f-1(x) = x - 20
C. f-1(x) = 
- 20
D. f-1(x) = 
+ 20
Use the given transformation to evaluate the integral. src="https://sciemce.com/media/4/ppg__10612191744__f1q49g7.jpg" alt="" style="vertical-align: -4.0px;" />
Rwhere R is the parallelogram bounded by the lines 
A. 420
B. 
C. 
D. 840
Convert the area as indicated.216 square inches to square feet
A. 18 ft2 B. 1.5 ft2 C. 2592 ft2 D. 31,104 ft2