Use a right triangle to write the expression as an algebraic expression. Assume that x is positive and in the domain of the given inverse trigonometric function.cos(tan-1 x)
A. 
B. 
C. 
D. x
Answer: A
Mathematics
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Express the number in scientific notation.4,200,000,000,000
A. 4.2 × 1012 B. 4.2 × 10-12 C. 4.2 × 10-9 D. 4.2 × 109
Mathematics
Use the quadratic formula to solve the equation.9x2 + 5x + 1 = 0
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B. {
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C. {
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D. {
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Mathematics
Evaluate the expression for x = -2, y = 3, and a = -4.-3x + 7y + 5a
A. 7 B. -7 C. -43 D. 23
Mathematics
Find the absolute value.|-2|
A. 1 B. 0 C. -2 D. 2
Mathematics