Simplify. Assume that no radicands were formed by raising negative quantities to even powers.
A. 2x
B. x
C. 2x
D. 2x
Answer: A
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Write the decimal point in the correct location. 
A. 319 B. 3190.0 C. 3.19 D. 31.90
Use = or ? for ? to write a true sentence.
? 
A. = B. ?
Figure (a) shows a vacant lot with a 100-ft frontage in a development. To estimate its area, we introduce a coordinate system so that the x-axis coincides with the edge of the straight road forming the lower boundary of the property, as shown in Figure (b). Then, thinking of the upper boundary of the property as the graph of a continuous function f over the interval [0, 100], we see that the problem is mathematically equivalent to that of finding the area under the graph of f on [0, 100]. To estimate the area of the lot using a Riemann sum, we divide the interval [0, 100] into five equal subintervals of length 20 ft. Then, using surveyor's equipment, we measure the distance from the midpoint of each of these subintervals to the upper boundary of the property. These measurements give the
values of f(x) at x = 10, 30, 50, 70, and 90. What is the approximate area of the lot?
?
?
?
A. 7,900 sq ft
B. 8,600 sq ft
C. 8,100 sq ft
D. 8,400 sq ft
Write the equation of the line using the information given about its graph.Rate of change 9, y = - 
when x = 0
A. y = - 
x + 9
B. y = 9x + 
C. y = 9x - 
D. y = - 
x - 9