Find the greatest common factor of the terms.20ab, 14a2, 10ab2, -6b2
A. 4
B. 2ab
C. 2a
D. 2
Answer: D
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If f is the focal length of a convex lens and an object is placed at a distance v from the lens, then its image will be at a distance u from the lens, where f, v, and u are related by the lens equation 
Find the rate of change of v with respect to u.
Write an equation for the line described. Give your answer in slope-intercept form.vertical, through (3, 4)
A. y = 3 B. x = 3 C. x = 4 D. y = 4
Answer the question about percent. Round to the nearest hundredth where necessary.What is 15% of 400?
A. 0.6 B. 6 C. 600 D. 60
Solve the problem using your calculator.Two separate tests are designed to measure a student's ability to solve problems. Several students are randomly selected to take both tests and the results are shown below. Use linear regression to find a linear function that predicts a student's score on Test B as a function of his or her score on Test A.
A. y = -0.930 + 19.4x B. y = -19.4 - 0.930x C. y = 0.930 - 19.4x D. y = 19.4 + 0.930x