Solve the problem.A zoom lens in a camera makes a rectangular image on the film that is 6 cm × 5 cm. As the lens zooms in and out, the size of the image changes. Find the rate at which the area of the image begins to change (dA/df) if the length of the frame changes at 0.6 cm/s and the width of the frame changes at 0.2 cm/s.
A. 
m2/s
B. 4.2 m2/s
C. 0.84 m2/s
D. 4.6 m2/s
Answer: B
Mathematics
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First rewrite the quadratic function in standard form by completing the square, then find any x-intercepts and any y-intercepts.f(x) = x2 + 7x + 10
A. x-intercepts: 2 and -5; y-intercept: 0 B. x-intercepts: -2 and 5; y-intercept: 10 C. x-intercepts: 2 and 5; y-intercept: -9 D. x-intercepts: -2 and -5; y-intercept: 10
Mathematics
Find the zeros of the quadratic function using the Square Root Method. List the x-intercepts of the graph of the function.g(x) = (x - 6)2 - 49
A. x = -1, x = 13 B. x = -7, x = 7 C. x = -13, x = -1 D. x = 55
Mathematics
Solve. Check for extraneous solutions.
= 9
A. {-2, 2} B. {0, -2} C. {-2} D. ?
Mathematics
Solve the equation.9b2 + 30b + 21 = -4
A. 
B. 
C. 
D. 
Mathematics