Which of the following expressions is equal to - x^2 - 4?

A. (-x-2i) (x+2i)

B. (-x - 2i) (x - 2i)

C. (x+2i) (x-2i)

D. (-x+2i) (x-2i)

What is the joint relative frequency for 11th graders who want the break in the afternoon? Round to the nearest percent.

Imagine that 200 mice are sent through the maze one at a time. The researchers believed that the probability of a mouse turning left due to the food is 0.7. How many left turns would they expect from 200 mice?

Scores on a test are normally distributed with a mean fo 69.2 and a standard deviation of 9.4, find p81

sarah has 9 aplles she divideed among 3 people. how many apples does esch person get

List the integers that satisfy both these inequalities | 2x + 9-12

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How do you solve 4y^-3-x^2y^-1?

A species' population dropped from 2000 in the year 2000 to 1200in the year 2011. Find the percent decrease in its population

How many solutions are there in the equation below 8x+11=8x+8

A gym teacher has $250 to spend on volleyball equipment. She buys 4 volleyball nets for $28 each. Volleyball cost $7 each. How many volleyball can she buy?