15+3x=45 I'm sorry but there will be a lot of questions I need to ask. But can someone help me with this one too?

What should be done to solve the equation? x+14=21 add 14 to both sides of the equation. subtract 14 from the left side of the equation. add 14 to the left side and subtract 14 from the right side of the equation. subtract 14 from both sides of the equation.

What is the area of a rectangle with vertices (-8,-2), (-3,-2), (-3,-6), and (-8,-6)? units

If f(x) = 3x-2 and g(x) =2x+1 find (f-g)(x)