Step-by-step explanation:
what's the problem ?
you need to just calculate the result ?
if so, then just enter the values at the corresponding locations of the variable names and then ... calculate.
you made some typos here, so it is not clear what n is supposed to be.
is it
n = 1/4
or
n = -1/4
?
and are there any other typos here that are not obvious but change the problem ?
I can see here the basic expression
4(n + 3) - 5r
r = 1/5
n is the "?" as described above.
so I will do both cases with the expression i could see here.
n = 1/4
4(1/4 + 3) - 5×1/5 = 4×1/4 + 4×3 - 5×1/5 = 1 + 12 - 1 = 12
n = -1/4
4(-1/4 + 3) - 5×1/5 = -4×1/4 + 4×3 - 5×1/5 = -1 + 12 - 1 = 10
please pick the one that fits to the original problem description.
