What is an expression that is equal to 12m+12n

Rose bought a new hat when she was on vacation. the following formula describes the percent sales tax rose paid b=t-c/c

Acampus club held a bake sale as a fund raiser, selling coffee, muffins, and bacon and eggs sandwiches. the club members charged $1 for a cup of coffee, 3$ for a muffin , and $4 for a back. and egg sandwich. they sold a total of 55 items , easing $119. of the club members sold 5 more muffins than cups of coffee, how many bacon and egg sandwiches he’s did they sell

If x-1 and x+3 are the factors of x3+10x2+ax+b find a and b