Can someone help me pls !

What is the y intercept of f(x)=(1/2)^x?

Write the function for the graph. (1.8) (0,4)

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?