Which of the following is equivalent to √-80?

A. - 4i√5

B. 16i√5

C. 4i√5

D. 2i√5

Evaluate u/z+xy^2 for u=10, x=3, y=7, and z=5 What is the value of xy/z if x=-2, y=-6, and z=4

How do you get the answer of 4n-9=-9

3:7ratio of blue and red chairs if there are 91 red chairs how many blue are there?

Micheal is taking a survey of students at his high school to find out how many hours they work per week. He surveys all of the students in his freshmen English class. Is this good sampling method

Find the output, f, when the input, t, is 7. f = 2t - 3

Is this a solution? What makes this a solution is if both equations equal the same answer. 3x+y=11 and x-2y=6 Solution: (4,-1) Is it a solution?

On a very cold morning, it was - 8°F. As the day went on, the temperature rose 2 degrees each hour. Which equation shows the temperature over time? A. y = - 2x + 8 B. y = - 2x - 8 C. y = 2x + 8 D. y = 2x - 8

Write the number 0.72 as a fraction or mixed number.

1. Write a numerical expression for the phrase "twelve groups of the sum of fourteen and 10." 2. Write an algebraic expression for the phrase "five groups of a number added to seventeen."

What is 2x + 8 - 22x = - 2