Is your equation written wrongly or something? because if i use the equation u are giving, I get -512 which is not of any of the above...
ON = 8x • 8
LM = 7x + 4
NM = x - 5
OL = 3y - 6
OL is congruent & parallel to NM
LM is congruent & parallel to ON
So,

Simplify

subtract 7x from both sides

divide 57 from both sides

Substitute x into equations




NM & OL = -28/57
ON & LM = 4 + (28/57)
False
When rounding, five or more will make the value go up.
Your change value is a 6 so the dollar value should be $45
23:8 is the simplest form. However, you can put 5.75:2 or even 2.86/1 if you are looking for the absolute simplest
2.456 x 10^11= 245600000000