Solve the problem.The length of a rectangle is twice the width. Let W be the width, L be the length, and P be the perimeter, all units in feet.a. Sketch three possible rectangles in which the length is twice the width.b. Which of the symbols W, L, and P are variables?c. Which of the symbols W, L, and P are constants?
What will be an ideal response?
a. The rectangles are not drawn to scale. Answers may vary. 
b. W, L, P
c. None
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A company installs 5,000 light bulbs. The lifetimes of the lightbulbs are approximately normally distributed with a mean of 500 hours and a standard deviation of 100 hours. Find the approximate number of bulbs that can be expected to last the indicated amount of time.More than 740 hours
A. 49 B. 40 C. 499 D. 4960
Describe the graph of the polar equation.r = -9 csc ?
A. Circle of radius 9 centered at origin B. Vertical line through (-9, 0) C. Horizontal line through (0, -9) D. Line through origin with slope -9
Write the expression in the standard form a + bi.7(4 - 3i)
A. 28 + 21i B. 4 - 21i C. 28 - 21i D. 28i - 3i
Complete the square. Then write the perfect-square trinomial in factored form.x2 - 
x
A. x2 - 
x + 
; 
2
B. x2 - 
x; 
2
C. x2 - 
x + 9; 
2
D. x2 - 
x + 
; 
2