Simplify. Write your answers in the form of a+bi, where a and b are real numbers.
A. 
- 
i
B. 
+ 
i
C. 
+ 
i
D. 
+ 
i
Answer: B
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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.Between 540 hours and 780 hours
A. 2,215 B. 1,717 C. 2,217 D. 1,710
Solve for I: P = I2R
a. ÚÄÄ I = ûPR b. R I = Ä P c. ÚÄ ³R I = ³Ä ûP d. ÚÄ ³P I = ³Ä ûR e. R I = Ä R
Solve the system of equations.2x2 - 5y2 = 52x2 + 4y2 = 86
A. (-5, -3), (-3, -5) B. (5, 3), (3, 5), (-5, -3), (-3, -5) C. (5, 3), (-5, 3), (5, -3), (-5, -3) D. (5, -3), (5, 3)
Simplify.
? 
A. 
B. 
C. 
D. 