If A denotes the area of the sector of a circle of radius r formed by the central angle ?, find the missing quantity. If necessary, round the answer to two decimal places.r = 9 feet, A = 39 square feet, ? = ?
A. 0.96 radians
B. 1,579.5 radians
C. 3,159 radians
D. 0.48 radians
Answer: A
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Combine like terms whenever possible.14x7 - 10x7 + 11x5 + 3x7 - 3x5
A. 15x12 B. 7x7 + 8x5 C. 15x7 D. Not possible
Solve the problem.The average value of a certain type of automobile was $13,020 in 1993 and depreciated to $4020 in 1996. Let y be the average value of the automobile in the year x, where x = 0 represents 1993. Write a linear equation that models the value of the automobile in terms of the year x.
A. y = -3000x + 13,020
B. y = -3000x - 4980
C. y = -3000x + 4020
D. y = - 
x - 4020
Find the indicated function.The length and width of a rectangle have a sum of 78. If x represents the width, what is a function to represent the area of the rectangle?
A. A(x) = x(78 - x) B. A(x) = (x - 78)(x - 78) C. A(x) = (78 - x)(78 - x) D. A(x) = x(x - 78)
Factor the polynomial completely. If the polynomial cannot be factored, write "prime."x2 + 3xy - 28y2
A. prime B. (x + 7y)(x - 4y) C. (x - 7y)(x + y) D. (x - 7y)(x + 4y)