Helpp please?

Question

Simplify.

1.) 5 to the second power - 15 + 2 - 3 to the second power

A. 3
B. -9
C. 9


EVALUATE.

2.) 12x - 6y + 11 - 9x + 7y
for x =3 and y=-10

A. -10
B. 0
C. 10

Answer 1

(5)² - 15 + 2 - (3)² =

25 - 15 + 2 - 9 =

10 + 2 - 9 =

12 - 9 =

3

- - - - - -

12x - 6y + 11 - 9x + 7y =

12x - 9x - 6y + 7y + 11 =

3x + y + 11

3(3) - 10 + 11

9 - 10 + 11

- 1 + 11

10

- - - - - - s-

Answer 2

Use the order of operations. For #1, evaluate 5^2 and 3^2 as 25 and 9 respectively. you now have 25-15+2-9. Perform the addition and subtraction from left to right to obtain 25-15+2-9=10+2-9=12-9=3.

For #2, substitute 3 for x and 10 for y. You now have 12*3-6*10+11-9*3+7*10. Do the multiplications first to get 36-60+11-27+70. Now do the addidition and subtraction fro left to right to get 36-60+11-27+70=-24+11-27+70=-13-27+70=-40+70=30. These calculations are correct, but 30 is not on the list of possibilities. You probably wrote the problem down wrong or wrote the list of possibilities wrong.

Answer 3

5² - 15 + 2 - 3² =
25 - 15 + 2 -9 =
3


12x - 6y + 11 - 9x + 7y @ x = 3 & y = -10 =
12*3 - 6*-10 + 11 - 9*3 + 7*-10 =
36 + 60 + 11 - 27 -70 =
10

Answer 4

1) 5^2 - 15+2-3 = 25 -15+2-3 = 9
2)12x-6y+11-9x+7y = x(12-9) + y(-6+7) + 11 = 3x+y+11
= 3(3)+(-10)+11 = 9-10+11 = 10

Answer 5

Remember order of operations -- PEMDAS (parentheses, exponents, multiplication, division, addition, subtraction).

1. 25 - 15 + 2 - 9
25 + 2 - 15 - 9
27 - 24 = 3

2. Use substitution
12(3) - 6(-10) + 11 - 9(3) + 7(-10)
36 - (-60) + 11 - 27 + (-70)
36 + 60 + 11 - 27 -70
107 - 97 = 10

Answer 6

5^2 -15 +2 -3^2 = 25 -15 + 2 -9 =1 = 3

12x -6y +11 -9x +7y
= 3x +y +11 = 3(3) +(-10) +11
=9 -10 +11 = 10

Answer 7

5^2-15+2-3^2
Please Excuse My Dear Aunt Sally
parantheses, exponents, multiplication & division, addition & subtraction.
25-15+2-9
left to right
10+2-9
12-9
3 OR A

12x-6y+11-9x+7y
just fill it in first
12(3)-6(-10)+11-9(3)+7(-10)
36+60+11-27-70
96+11-27-70
107-27-70
80-70
10 OR C

Answer 8

#1= 9