When working with a circle, ?d represents _____.
a. the diameter
b. the radius
c. the circumference
d. an arc
c. the circumference
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Two types magnets are in use today: the electromagnet and the ____________________ magnet.
Fill in the blank(s) with the appropriate word(s).
A production facility contains two machines that are used to rework items that are initially defective. Let X be the number of hours that the first machine is in use, and let Y be the number of hours that the second machine is in use, on a randomly chosen day. Assume that X and Y have joint probability density function given by
a. What is the probability that both machines are in operation for more than half an hour?
b. Find the marginal probability density functions 
and 
.
c. Are X and Y independent? Explain.
Compute the maximum deflection in span BC of the beam in Figure P7.37 and the slope on each side of the hinge. Solve by the conjugate beam method.
The ____________________ process reduces the hormone level in meat by 90 percent.
Fill in the blank(s) with the appropriate word(s).