here's half of them:
1: 15 - (3r) = 6
2: q + 4f = 29
3: [tex]n^{2}[/tex] + 12 = p/4
4: 0.5j - 5 = k + 13
for the rest, just know that:
sum means addition
times/product means multiplying
quotient means division
less than means subtraction
