What is the value of x that makes this equation true? (10 raised to the power of 4) = 10 raised to the power of x

Enter only a number as your answer.

Agiven line has the equation 2x + 12y = −1. what is the equation, in slope-intercept form, of the line that is perpendicular to the given line and passes through the point (0, 9)? y = ( )x + 9

If f(x)=2x-6 and g(x)=3x+9, find (f-g)(x)

Can someone check if i did this correct. it’s number 4 if you’re wondering.