Multiply. Write the result in the form a + bi.(
+ 3i)(
- 3i)
A. -3
B. 6 - 9i
C. 6 - 2i
D. 15
Answer: D
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Suppose u and v are differentiable functions of x. Use the given values of the functions and their derivatives to find the value of the indicated derivative.u(1) = 2, u '(1) = -6, v(1) = 6, v '(1) = -3.
(2u - 4v) at x = 1
A. -24 B. 28 C. -20 D. 0
Solve the formula for the indicated variable. Then use the supplied values to solve the equation.The relationship between the distance p from an object to a lens, the distance q from the image to the lens, and the focal length f (the distance from the lens to the principal focus) is given by 
Solve for f. What is the focal length when p is 726 mm and q is 24.2 mm? (All values are approximate.)
A. f = p + q = 750 mm
B. f = 
+ 
= 1.00 mm
C. f = 
= 23.4 mm
D. f = pq - p - q = 16,800 mm
Solve the problem.Find the value for x in the following special right triangle. Use exact values. 
3 m
A. 6
m
B. 
m
C. 6 m
D. 3
m
Solve.16x2 + 64y2 = 1024y - x = 4
A. 
, (3, 7)
B. 
, (2, 6)
C. 
, (0, 4)
D. 
, (4, 0)