Find the approximate area of the circle. Use 3.14 for ?.
A. 65.94 square yd
B. 346.185 square yd
C. 131.88 square yd
D. 1384.74 square yd
Answer: B
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Convert the polar equation to rectangular form. Identify the curve.? = 
A. y = - 
x2; a circle centered at (0, 0) with radius 1
B. y = 
x; a line with slope - 
and y-intercept 0
C. x2 + y2 = 1; a circle centered at (0, 0) with radius 1
D. y = - 
x; a line with slope - 
and y-intercept 0
Solve the problem.The function f(x) = 200(0.5)x/90 models the amount in pounds of a particular radioactive material stored in a concrete vault, where x is the number of years since the material was put into the vault. Find the amount of radioactive material in the vault after 
Round to the nearest whole number.
A. 225 pounds B. 147 pounds C. 42 pounds D. 44 pounds
Use elimination by substitution to find the solution for the following system.
A. x = 10, y = 5 B. x = 9, y = 6 C. x = 10, y = 9 D. The system is inconsistent.
Use the distributive property to rewrite a sum as a product or the product as a sum.-(-4 - 4r)
A. -4 + 4r B. 4 + 4r C. -4 - 4r D. 4 - 4r