Please help me! I'm taking a test that closes in 10 minutes! 1) Simplify √-49 using the imaginary unit i.
2) Simplify √-20 using the imaginary unit i.
3) Simplify the expression. Write it in standard form. (-3 + 2i) + (2 + i)
4) Simplify the expression. Write it in standard form. (9 +4i)²
5) Simplify the expression. Write it in standard form. (5i √-32) (i √-27)

Answers:

1)

2)

3)

4)

5)

Hope this helps! :)

hello from mrbilldoesmath!

answer:

x - 3

discussion:

x^2 - 9 = (x-3) (x+3)   so

(x^2-9)/ (x + 3) = x-3

you,

mrb

answer: the answer is (b) amie should have multiplied

step-by-step explanation: given a sphere and a cylinder with same radius and height.

let, 'r' be the radius of the cylinder and sphere and 'h' be the height of the cylinder. according to the question,

r = h.

now, the volume of the sphere will be

and the volume of the cylinder will be

therefore, we have

thus, ammie should have multiplied the volume of the sphere