Determine whether the function is one-to-one.f(x) = 4x + 9
A. Yes
B. No
Answer: A
Mathematics
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Solve the problem.Water is falling on a surface, wetting a circular area that is expanding at a rate of 
How fast is the radius of the wetted area expanding when the radius is 
(Round your answer to four decimal places.)
A. 0.0685 mm/s B. 0.0218 mm/s C. 91.7344 mm/s D. 0.0109 mm/s
Mathematics
Find the period of the function.y = -5 cos x
A. ?
B. 
C. 2?
D. 5
Mathematics
Provide an appropriate response. Which statement illustrates the use of the commutative property of addition?
A. 5 + (12 + 4) = (5 + 4) + 12 B. 5 + (12 + 4) = 5 + (4 + 12) C. (12 + 4) × 5 = 5 × (12 + 4) D. 5 + (12 × 4) = 5 + (4 × 12)
Mathematics
A pair of similar triangles is shown. Find the measure of the segment marked with the letter x.
A. x = 5 B. x = 8 C. x = 7 D. x = 6
Mathematics