Since you have the whole surface area of the cube, you just divide 150 by 6, for each face
So the answer is 25 for one face of the cube.
About $1.80 because 8.7590 divide by 4.80 is about$1.80
There are 0 solutions because the lines are parallel and will never intersect.
Note the equal sign. What you do to one side, you do to the other. Isolate the a.
Add 4 to both sides
a- 4 (+4) = 15 (+4)
a = 15 + 4
a = 19
19 is your answer for a
hope this helps