Answer:
Equation D
Explanation:
We'll place 5 as g in all equations to test it.
A. LHS: g + 4
(5) + 4
=9
RHS: 15
Hence, equation A can not be certified.
B. LHS: g - 1
(5) - 1
=4
RHS: 15
Hence, equation B can not be certified
C. LHS: 40 + g
40 + (5)
=45
RHS: 50
Hence, equation C can not be certified
D. LHS: g - 3
(5) - 3
=2
RHS:2
Hence, equation D can be certified.