Please help with this question. Need asap! Thank you

Question

1. Collect like terms.  14u squared + 17v + 16u squared=

2. Add the following. Do not use a number line except as a check. 

    -6/7 + (-7/20)=   *Note: Multiplying across is not the answer. I tried and it's not right.*

3. Solve.  3x + 8x = 88   (Type an integer or a simplified fraction.)

4.Solve for j.  

        D= js

5. Multiply. 

5/3 • (1/4)  Note: The answer should be an integer or a simplified fraction. I tried to multiply across and answer with fraction but it's not the answer. Please help me get this.

6.  Evaluate (-2z)squared and -2z squared when z= 10.

1.  (-2z) squared=

2.  -2z squared=

Note: So there should be two answers according to my classwork. One with parentheses and one without. Please let me know if you have any questions. Need this in an hour! Thank you!

Answer 1

 

1	sqrt(30u)+17v
2
	-6/7	-120/140
	-7/20	-49/140
		-160/140	-160
	-1 20/140
	-1 1/7
3	11x=88
	x=8
4	D=js
	j=d/s
5	5/3*1/4
	5/12
6
	sqrt(-2*10)	sqrt(-20)	sqrt(20)*i
	-sqrt(-2*10)	-SQRT(-20)	-sqrt(20)*i

Answer 2

i dont quite get number 6.

Comments

i = sqrt(-1)
when z=10
Sqrt(-2z)=sqrt(-20z)=i*sqrt(20z)=2isqrt(5)
-Sqrt(-2z)=-sqrt(-20z)=-i*sqrt(20z)=-2isqrt(5)
(forgot to simplify sqrt(20) the first time)

Answer 3

oops I read sqrt not squared my previous answers for #6 are wrong.

-2z^2=-2*100=-200

(-2x)^2=4x^2=4*100=400

when z=10