Question

M + 5n; use m = 1, and n = 4

Answer 1

`m + 5n; \\ m = 1, \\ n = 4 \\ ======= \\ 1+5 \cdot4= \\ 1+20= \\ \boxed{21}`

Answer 2

If "m" = 1 and If "n" = 4

Your problem becomes↓
`1 + 5(4)`


`5(4) = 20`


`1 + 20 = 21`

Therefore your answer is:
`21`

Just do PEMDAS


`Parentheses`

`Exponents`

`Multiplication`

`Division`

`Addition`

`Subtraction`

From the looks of it we have used the "addition " and "multiplication" method of the PEMDAS strategy