First Part:
For every parenthesis with a plus sign to its left, you can eliminate the parenthesis (take into account that plus×minus=minus)
a + a - b - a + b
Then you add like terms. This means you add/subtract a with a and same with b and b (I'll organize the terms in alphabetical order but it's not neccesary)
a + a - a - b + b
Since a - a =0 and b - b = 0,
a + 0 + 0
Answer: a
Second part
Since you have a minus to the left of a parenthesis, you have to change the signs of all the terms inside the parenthesis before you eliminate the parenthesis.

Answer: 2a^2
Answer:
y=4/3x+5
Step-by-step explanation:
Perpendicular means the slope will be the negative reciprocal.
So the slope=4/3
y=4/3x+b
Now, enter the point (3,9) into the equation.
9=4/3(3)+b
9=4+b
b=9-4
b=5
Answer: Yes
Step-by-step explanation:
Using the vertical line test, we draw a bunch of lines that go up and down. We can see there is no point where a vertical line has 2 intersections.
Answer:
4.43
Step-by-step explanation:
7.90
- 3.47
__________
4. 4 3
I couldn't regroup but of you cross out 0 and put 10, 10-7= 3
and you have to borrow one from 9 and make it 8 and 8-4=4
Answer:
33-28=5
Step-by-step explanation:
hope this helps