Can u help me with these questions

here's half of them:

1: 15 - (3r) = 6

2: q + 4f = 29

3: + 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

the equation cos(35) =a/25 can be used to find the length of bc what is the length of bc? round to the nearest tenth

step-by-step explanation:

c: lkllmn.

hope it's you