Please help me I am so lost(solve algebraically) ​

The table represents a function f(x). what is f(3)? a.-9 b.-1 c.1 d.9

Identify the number as a rational or irrational.explain. 127

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?