Answer:
Its B
Step-by-step explanation:
-6.2n + 8.8m - 14m - n
= 8.8m - 14m -6.2n - n
= - 5.2m - 72n
First replace the letters with the numbers it gave so you have 3(2)(7)^2-(2)^2
multiply the 3 and 2 together to make 6(7)^2-(2)^2
do seven to the second power (7x7) so you get 6(49)-(2)^2
-(2)^2 is the same as -1(2)^2, so that can just become -2^2. so you now have 6(49)-2^2
multiply 6x49 so you have 294-2^2
do two to the second power (2x2) so you get 294-4
294-4=290
5x - 3 = 7
<em><u>Add 3 to both sides.</u></em>
5x = 10
<em><u>Divide both sides by 5.</u></em>
x = 2
The value of x is 2.

← multiply both the numerator and the denominator by 10

<span>← simplify
</span>

The answer's

.
8-2(n+3)=n+7-3n
We move all terms to the left:
8-2(n+3)-(n+7-3n)=0
We add all the numbers together, and all the variables
-2(n+3)-(-2n+7)+8=0
We multiply parentheses
-2n-(-2n+7)-6+8=0
We get rid of parentheses
-2n+2n-7-6+8=0
We add all the numbers together, and all the variables
-5!=0
There is no solution for this equation