Using the addition/subtraction method, find the value of x and y to satisfy the following equations: x + 2y = 4; 2x - 3y = 7
a. x = 15 y = 7/2
b. x = 60 y = 15
c. x = 7/13 y = 7/2
d. x = 31/7 y = 2/7
e. x = 26/7 y = 1/7
e. x = 26/7 y = 1/7
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A company installs 5000 light bulbs, each with an average life of 500 hours, standard deviation of 100 hours, and distribution approximated by a normal curve. Find the approximate number of bulbs that can be expected to last the period of time.Less than 200 hours
A. 4 bulbs B. 10 bulbs C. 4444 bulbs D. 25 bulbs
Solve the problem.
Let x = 24 and y = 6. Find the pitch of the roof.
A. 
B. 
C. 
D. 
Solve the equation. If the solutions involve square roots, give both the exact solutions and the approximate solutions to three decimal places.
- 
= 
A. 
? 6.782
B. 37
C. 74
D. -37
Write a fraction and a percent for the shaded part of the figure.
A. 
or 0.07%
B. 
or 0.7%
C. 
or 70%
D. 
or 7%