The graph shows that the cost of the average college mathematics textbook has been rising steadily since 1990.
a. What is the y-intercept?b. What is the slope?c. What is the equation of this line, in slope-intercept form?d. Predict the cost of an average college mathematics textbook in 2016.
What will be an ideal response?
a. 46
b. 6
c. y = 6x + 46
d. 202
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For the region R, find the horizontal line y = k that divides R into two subregions of equal area.R is the region bounded by y = 7 - x, the x-axis, and the y-axis.
A. k = 7 - 
B. k = 1 - 
C. k = 7 + 
D. k = 7 - 
Decide if the statement is true or false.sin ? decreases in value as ? goes from 0° to 90°.
A. True B. False
Use properties of exponents to simplify the expression. Express answers in exponential form with positive exponents only. Assume that any variables in denominators are not equal to zero.(x5 ? x2)-3
A. 
B. 
C. 
D. x21
Two sides of a triangle are m and m in length and the angle between them is increasing at a rate of 0.06 rad/s. Find the rate at which the area of the triangle is increasing when the angle between the sides of fixed length is 
Select the correct answer.
a. 1.145 
b. ?0.955
c. 0.090
d. 5.045
e. ?1.955