Is this function linear or nonlinear?

y=2^2-4

linear

nonlinear

Luis left a 20% tip on a $30.00 food bill. How much did he leave for the tip?

Proper inverse operation 14 + 17 = 31

The sum of two numbers is 15. The larger number is 2 less than three times the smaller number. What are the two numbers? Write an equation that can be used to express the problem as a system of two linear equations in slope-intercept form.

Find the percent of each number what's 25% of 56

Lauren owns 28 acres of land which she rents to a farmer for $3812 per acre per year. Her property taxes are $972 per acre per year. How much profit does she make on the land each year?

A charitable organization is planning a benefits concert to generate funds for their projects. Tickets for the event are $10 for lower level seating or $25 for the higher level seating. The concert hall can seat up to 5000 people.

State if the three numbers can be the measures of the sides of a triangle

Iley has bottles that hold 678 pennies each. About how many pennies does she have if she has 6 bottles filled with pennies?

N over 4 - 20 = - 1 how do i solve this

It takes 32 people to build 8 houses. How many people would it take to build 20 houses? (hint simplify your ratio first)