Can someone help me please

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?

What is 74 round to the nearest ten

Is (root2 -2)^2 rational or irrational. show the steps and answer fast