Solve. Round to the nearest hundredth, if necessary.The time T necessary to make an enlargement of a photo negative varies directly as the area A of the enlargement. If 245 seconds are required to make a 5-by-7 enlargement, find the time required for a 7-by-9 enlargement.
A. 378 sec
B. 567 sec
C. 441 sec
D. 504 sec
Answer: C
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Find the book value after the given number of years, using the straight-line method. Round your answer to the nearest dollar.Find the book value at the end of 5 years.Cost:$77,500Estimated life:50 yearsEstimated scrap value:$4,650
A. $7,285 B. $69,750 C. $76,043 D. $70,215
Solve by separating the two absolute values into equal and opposite cases.
= 
A. ?
B. 
C. {- 
, - 
}
D. {
, 
}
List all the elements of B that belong to the given set.B = {5, 
, -13, 0, 
, 
, 0.57}Irrational numbers
A. 
, 
B. 
C. 
, 0.57
D. 
, 
, 0.57
Provide an appropriate response.Explain the idea of a related rate.
A. A function y = f(x) is a function of x, but if x can be expressed as a function of some other variable, such as time, t, then y is also a function of t, and the dependence of y on t is related to the dependence of x on t, which means, in turn, that the rate of change of y, dy/dt, is related to the rate of change of x, dx/dt, by the relation 
= 
? 
.
B. A function y = f(t) is a function of t, but y can generally be related to x if x is also a function of t; that is, dy/dt ? dx/dt.
C. A function x = f(t) is a function of t, but x can generally be related to y if y is also a function of t; that is, dx/dt ? dx/dy.
D. A function y = f(x) is a function of x, but if x can be expressed as a function of some other variable, such as time, t, then y is also a function of t, and the dependence of y on t is related to the dependence of x on t, which means, in turn, that the rate of change of y, dy/dt, is related to the rate of change of x, dx/dt, by the relation 
= 
? 
.