Solve the problem.R and R' are similar rectangles. Suppose that the width of R is a and the width of R' is 4a. If the area of R is 50 sq. in., what is the area of R' ?
A. 800 sq. in.
B. 200a sq. in.
C. 400 sq. in.
D. 200 sq. in.
E. none of these
Answer: A
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Solve the problem.A 20-kg mass is attached to a spring that hangs vertically and is stretched 3 m from the equilibrium position of the spring. Assume a linear spring with F(x) = kx. How much work is required to stretch the spring and lower the mass 1 m? Round to four decimal places when appropriate.
A. 16.3333 J B. 424.6667 J C. 228.6667 J D. 212.3333 J
Find the expected value.A new light bulb has been found to have a 0.02 probability of being defective. A shop owner receives 500 bulbs of this kind. How many of these bulbs are expected to be defective?
A. 20 B. 100 C. 10 D. 500
Solve the inequality.3 + 
- 
? 0
A. (-?, -5] ? 
B. [-5, 0) ? 
C. 
D. 
Solve the equation by first applying the multiplication property of equality to produce an equivalent equation with integral coefficients.
What will be an ideal response?