What is two minutes and thirty seconds minus forty - five seconds

The graph represents the gallons of water in a water tank with respect to the number of hours since it was completely filled

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?

The functions f(x) and g(x) are shown in the graph f(x)=x^2 what is g(x) ?