Workout the value of 5g + 3h when g = 7 and h = 4

5 times 7 is 35 then add 3 times 4 is 12. So its 35+12

5g would basically be 5 multiply whatever g is
In this case, g is 7 so therefore
7x5=35
3x4=12

Then 35+12=
47

So the answer is 47

38+105= 143, 39+104=143, and you will find then adding the numbers on opposite sides, moving inwards yields the answer 138 every time. because of this, you’re going to multiply 138 times the number of pairs, which is 34. therefore, 34*138= 4692(i’m sorry if it’s the wrong numbers, but it’s the right concept)