Question 1

Which equation has 1-i as a solution?

Accepted Answer

x²-2x + 2 = 0

Answer

x2+2x+2=0

Answer

x2-2x-2=0

Answer

x2+2x-2=0

Question 2

To the nearest tenth, the value of x that satisfies 2^x = -2x + 11 is

Accepted Answer

2.6

Answer

5.9

Answer

2.5

Answer

5.8

Question 3

The lifespan of a 60-watt lightbulb produced by a company is normally distributed with a mean of 1450 hours and a standard deviation of 8.5 hours. If a 60-watt lightbulb produced by this company is selected at random, what is the probability that its lifespan will be between 1440 and 1465 hours?

Accepted Answer

0.8415

Answer

0.4612

Answer

0.9612

Answer

0.3803

Question 4

A sine function increasing through the origin can be used to model light waves. Violet light has a wavelength of 400 nanometers. Over which interval is the height of the wave decreasing, only?

Accepted Answer

(100, 300)

Answer

(300, 400)

Answer

(200, 400)

Answer

(0, 200)

Question 5

The expression $\frac{x^3+2x^2+x+6}{x+2}$ is equivalent to

Accepted Answer

x²+1+ $\frac{4}{x+2}$

Answer

x2+3

Answer

2x²+1+ $\frac{4}{x+2}$

Answer

2x2+x+6

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