Am i correct on number 39 and 40

No, you did the distributed property wrong
on question 39, you said 6(x+4) = 6 · x +4 but its supposed to be 6 ·x + 6 · 4 since its distributed property so u got both of those questions wrong

The question is kind of confusing. if it's asking how many variations of answers can you give. then do 4^5 for your answer.this would be something like the first question could be a and the 2nd c or first b next c etc. if you can, ask the teacher for a better confirmation of what it's asking. if i'm assuming correctly what it's asking, it's 625 different variations.