Approximate the area under the curve and above the x-axis using n rectangles. Let the height of each rectangle be given by the value of the function at the right side of the rectangle.f(x) = 2x2 + x + 3 from x = -2 to x = 1; n = 3
A. 25
B. 17
C. 21
D. 13
Answer: D
Mathematics
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Evaluate the integral.
A. - 
+ C
B. - 
ln
+ C
C. - 
ln
+ C
D. 
- 5 ln
Mathematics
Find the limit of the sequence if it converges; otherwise indicate divergence.an = 
A. 0
B. 
C. 1
D. Diverges
Mathematics
Use the substitution method to solve the system.x - 7y = 50-4x - 8y = 16
A. (-8, -5) B. (7, -5) C. (8, -6) D. No solution
Mathematics
Solve the problem.A new car dealership sold 270 cars in 2010, and sales are increasing by about 58 cars per year. Let s be the number of cars sold in the year that is t years since 2010. Find an equation for a linear model to describe this situation. Then solve that equation for t.
A. t = 
B. t = 
C. t = 
D. t = 
Mathematics