Question

I need help?

Answer 1

which question are you up to on that page you uploaded?

Answer 2

i need 4?

Answer 3

9+3n=15
3n=6
n=2

Answer 4

show work??

Answer 5

9+3n=15
minus nine from both sides of the equation
9+3n-9=15-9
3n=6
divide both sides by three
3n/3=6/3
n=2

Answer 6

5. 2n+0.2=1.6
minus 0.2 from both sides
2n+0.2-0.2=1.6-0.2
2n=1.4
divide by 2
n=0.7

Answer 7

6. 3+4n =19
minus three
4n=16
divide by 4
n=4

Answer 8

7.
2x+11=17
minus eleven from both sides of the equation
2x=6
divide both sides by two
x=3

Answer 9

does this makes sense to you?

Answer 10

At any stage of an equation we can arbitrarily add (or minus) a constant to both sides ,
we can also multiply by a arbitrary constant (or divide (but you cant divide by zero))
These operations do not tip the scales.