The letters x and y represent rectangular coordinates. Write the equation using polar coordinates (r, ?).y = x
A. sin ? = cos ?
B. r = sin ?
C. sin ? = - cos ?
D. r = cos ?
Answer: A
Mathematics
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Solve the problem.Find the work done by a force of 14i (newtons) in moving an object along a line from the origin to the point 
(distance in meters).
A. 98.00 joules B. 96.98 joules C. 106.6 joules D. 15.23 joules
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Evaluate the function.Find f(4) for
A. -8 B. 16 C. 25 D. 7
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Approximate f(x) to four decimal places.f(x) = e-x, x = 0.8
A. 2.1746 B. 0.4493 C. 2.2255 D. 0.2943
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Solve the problem.For a culture of 70,000 bacteria of a certain strain, the number of bacteria N that will survive x hours is modeled by the formula N = 7000
. After how many hours will 21,000 bacteria survive?
A. 97 hr B. 91 hr C. 9 hr D. 79 hr
Mathematics