Find the missing value and write a conclusion. If necessary, round the percentage to the nearest tenth.What percent of 56 is 70?
A. 80% of 56 is 70.
B. 125% of 56 is 70.
C. 1.3% of 56 is 70.
D. 130% of 56 is 70.
Answer: B
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Solve the problem.Suppose that the radius r and volume V = 
?r3 of a sphere are differentiable functions of t. Write an equation that relates dV/dt to dr/dt.
A. 
= 4?r2
B. 
= 
?r2
C. 
= 3r2
D. 
= 4?
Graph the function in the window [-4, 4, 1] by [0, 8, 1]. State whether it illustrates exponential growth or exponential decay.f(x) = 2e0.7x
A. Growth B. Decay
Solve the problem.A chemist needs 11 liters of a 50% salt solution. All she has available is a 20% salt solution and a 70% salt solution. How much of each of the two solutions should she mix to obtain her desired solution?
A. 3.3 liters of the 20% solution; 7.7 liters of the 70% solution B. 4.4 liters of the 20% solution; 6.6 liters of the 70% solution C. 5.5 liters of the 20% solution; 5.5 liters of the 70% solution D. 2.2 liters of the 20% solution; 8.8 liters of the 70% solution
Let x represent the unknown. Using the given "word" equation, write an equation and solve.Building A is 92 ft taller than Building B. If Building B is 756 ft tall, find the height of Building A. height of Building A - 92 = height of Building B
A. x + 756 = 92; 664 ft B. 92 - x = 756; 92 ft C. 756 - x = 92; 756 ft D. x - 756 = 92; 848 ft