I need help with my geometry please !

Write an equation for the function that includes the points (2,100)and (3,100)

Which describes the difference between the graph of f(x)=x^2 and g(x)=-(x^2-2)

Acompany charges $0.10 for each letter engraved. bobby plans to spend no more than $5.00 on the engraving on a jewelry box. write and solve an inequality to find the maximum number of letters he can have engraved.