Solve the problem.Find the area A and circumference C of a circle of radius 9 yd. Express the answer in terms of ?.
A. A = 324? yd2; C = 9? yd
B. A = 18? yd2; C = 18? yd
C. A = 36? yd2; C = 9? yd
D. A = 81? yd2; C = 18? yd
Answer: D
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Calculate the flux of the field F across the closed plane curve C.F = x2i + y2j; the curve C is the closed counterclockwise path around the triangle with vertices at (0, 0), (1, 0), and (0, 2)
A. 0
B. 6
C. - 
D. 2
Solve the problem. Round to the nearest cent.The list price of a keyboard is $681. If the trade discount series offered is 5/10/25, find the net price by using the net decimal equivalent.
A. $244.31 B. $408.60 C. $272.40 D. $436.69
Solve.Joel has started a business mowing lawns for the summer. The bar graph below tracks his net income for five weeks. 
Find the difference in Joel's net income between week 1 and week 4.
A. $423 B. $215 C. $433 D. $225
What is the purpose of using the associative and commutative properties for addition of whole numbers? ?
A. ?It is important that children learn that a + b is the same as b + a. This understanding reduces the number of addition facts that they have to learn. B. ?Some groupings and numbers are easier to find their sums than other groupings. C. ?Some addition problems cannot be solved without changing their order or regrouping. D. ?The commutative property can help students understand that different answers in algebra are equivalent. E. ?All of the above F. ?a, b, and d are true.