Can you guys please help me im highly confused

n = √18

Step-by-step explanation:

-10n^2 -5 = -185

-10n^2 = -180

n^2 = 18

n = +- √18

5x+40

5(x + 8)

7x - 49

7(x - 7)

18x + 9

9(2x + 1)

15x - 10

5(3x - 2)

step-by-step explanation:

for number one all you have to do is factor 5 out of 5x + 40

for number 2 factor 7 out of 7x - 49

for number three factor 9 out of 18x + 9

for number four factor 5 out of 15x - 10

you can't solve x because it is 2 linear equation and you only have one equation