What is the solution to 2.8(2+0.5n)=2.4(n+1.2)

With #! i’ve tried to figure it out but i can’t.

You receive 15% of the profit from a car wash how much money do you receive from a profit of 300

Which equation can be solved to find one of the missing side lengths in the triangle? cos(60o) = cos(60o) = cos(60o) = cos(60o) = mark this and return