20 POINTS AGAIN PLEASE HELP BECAUSE I NEED SOME HELP !!

(A)

Remove parentheses:

3a^2+1 - 4+2a^2

Simplify:

3a^2+1 - 4+2a^2

Group like terms:

3a^2-2a^2+1-4

Add similar elements:

a^2++1-4

Add/ subtract the numbers:

a^2-3

Your Answer For Equation (A) Is a^2-3

(B)

Remove parentheses:

5p^2-3 + 2p^2-3p^3

Group like terms:

-3p^3+5p^2+2p^2-3

Add similar elements:

-3p^3+7p^2-3

Your Answer For Equation (B) Is -3p^3+7p^2-3

(C)

Remove parentheses:

5a+4 - 5a+3

Simplify:

5a+4 - 5a+3

Group like terms:

5a-5a+4-3

Add similar elements:

4-3

Subtract the numbers:

1

Your Answer For Equation (C) Is 1

(D)

Remove parentheses:

9r^3+5r^2+11r + -2r^3+9r-8r^2

Group like terms:

9r^3-2r^3+5r^2-8r^2+11r+9r

Add similar elements:

9r^3-2r^3-3r^2+11r+9r

7r^3-3r^2+11r+9r

7r^3-3r^2+20r

Your Answer For Equation (D) Is 7r^3-3r^2+20r

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can i see the following ?

step-by-step explanation:

it has to have an angle of 90 degrees