Express the statement as an equation involving the indicated variables.The surface area S of a sphere is 4 times ? times the square of the radius r.
A. S = ?r2
B. S = 4?r
C. S = 4?r2
D. S = 4? 
Answer: C
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Graph the function.y = log2(x - 1)
A. 
B. 
C. 
D. 
Evaluate the integral.
A. (2x + 4) ln 
+ C
B. 4 tan-1
+ C
C. 
sin-1
+ C
D. 
tan-1
+ C
Solve the problem.V = 
?r3, where r is the radius, in centimeters. By approximately how much does the volume of a sphere increase when the radius is increased from 1.0 cm to 1.2 cm? (Use 3.14 for ?.)
A. 2.7 cm3 B. 0.5 cm3 C. 2.3 cm3 D. 2.5 cm3
Solve the problem using your calculator.A study was conducted to compare the average time spent in the lab each week versus course grade for computer students. The results are recorded in the table below. Use a graphing calculator to model the data with a linear function that predicts a student's course grade as a function of the number of hours spent in lab. Number of hours spent in lab Grade (percent) 10 96 11 51 16 62 9 58 7 89 15 81 16 46 10 51
A. y = 0.930 + 44.3x B. y = 1.86 + 88.6x C. y = 44.3 + 0.930x D. y = 88.6 - 1.86x