Final answer:
To find m4, substitute the given values of m3 and m2 into the equation to find m4.
Step-by-step explanation:
To find m4, we first need to find the values of m3 and m2 using the given equations. Given that m3 = 6x+30 and m2 = 8x-60, we can substitute these values into the equation to find m4.
Therefore, m4 = m3 + m2 = (6x+30) + (8x-60) = 14x-30.