Find the length of the curve.The curve r = a cos2 
, 0 ? ? ? ?, a > 0
A. 2?a
B. 
C. 
D. 2a
Answer: D
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Solve the problem.For a school walk-a-ton, Rebecca got pledges totaling $7 per mile walked. If she walks 15,840 feet, how much money will she have collected for the walk-a-thon?
A. $110,880.00 B. $3.00 C. $63.00 D. $21.00
Solve the problem.Suppose economists use as a model of a country's economy the equation C = 0.6716D + 5.9845where C represents the consumption of products in billions of dollars and D represents disposable income in billions of dollars. Solve the equation for D and use the result to determine the disposable income D if the consumption C is $8.42 billion. Round your answer to the nearest tenth of a billion.
A. $3.6 billion B. $3.5 billion C. $11.6 billion D. $6.6 billion
Write an algebraic expression for the quantities being compared.The first angle of a triangle is triple the third angle. The second angle of a triangle is 20 degrees less than the third angle.
A. first angle = x - 20 second angle = 3x third angle = x B. first angle = 3x second angle = x - 20 third angle = x C. first angle = 3x + 20 second angle = x - 20 third angle = x D. first angle = x second angle = x - 20 third angle = 3x
Divide.(x2 + 4x + 4) ÷ (x + 2)
A. x - 2 B. x3 - 2 C. x2 + 2 D. x + 2