Much needed help I am having very hard time pls help .

The table shows the balance of a money market account over time. write a function that represents the balance y (in dollars) after t years.

If f(x)=x+7 and g(x)=1/x what is (fog)(x)

Frank has a devised a formula for his catering business that calculates the number of meatballs he needs to prepare. the formula is m=4a+2c, where c=number of children; m=number of meatballs; a=number of adults. how many meatballs are required for a party of 10 adults and 5 children?