Simplify the expression. Assume that all variables are positive when they appear.
A. 9x2
B. 3x2
C. 5x2
D. not a real number
Answer: B
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Round the number to the given place value.A swimmer swims the 200m butterfly in 2.22514 minutes. Round his time to the nearest hundredth.
A. 2.24 B. 2.225 C. 2.23 D. 2.22
Simplify the expression.-1.5x - 1.1x - 1.3x
A. -3.9x B. -5.4x C. -11x D. -1.5x - 1.1x - 1.3x
Approximate the area under the graph of f(x) and above the x-axis using n rectangles.f(x) = 
from x = 2 to x = 6; n = 4; use right endpoints
A. 7.60 B. 10.67 C. 10.27 D. 8.72
Solve the problem.The foundation for a cylindrical water tank is a cylinder 29 ft in diameter and 4 ft high. The formula for determining the volume of a cylinder is given by the algebraic expression ?r2h. How many cubic ft of concrete are needed to build the foundation? Use ? = 3.14. Round to the nearest tenth, if necessary.
A. 10,563 ft3 B. 2640.7 ft3 C. 728.5 ft3 D. 5281.5 ft3