I need answer for this question please!

The difference of 2 numbers is 21 and the quotient of the equation is 4 then what are the two numbers?

If you shift the linear parent function, f(x)=x, up 13 units, what is the equation of the new function?

(least common multiples) the answer that i had in the 1st step was lcm of airline tickets sold=72. idk if that even matters but just in case. ! three co-workers are busy selling airline tickets over the phone. in an 8-hour day, charles can sell 8 airline tickets, ann can sell 9 airline tickets, and michelle can sell 6 airline tickets. step 2 of 2: what is the smallest number of 8-hour days needed for each of them to achieve the same number of sales? it takes charles . it takes . it takes .