The sales tax rate at a sporting goods store is 7.5%. Sales tax on an item is a function of its price.
Which is the independent quantity in this function?
A The sales tax rate
B The price of the item
C The amount of sales tax on the item
D The total price of the item including the tax

Explain why the function is discontinuous at the given number a. (select all that apply.) f(x) = 1 x + 1 a = −1 f(−1) is undefined. lim x→−1+ f(x) and lim x→−1− f(x) exist, but are not equal. lim x→−1 f(x) does not exist. f(−1) and lim x→−1 f(x) exist, but are not equal. none of the above

Solve the system of equations. x=-2y+1 and x+2y=9. show work

Mallory has been offers two different jobs. she can baby sit for 6 hours a week and get $8.50 an hour. or she can work at the library for 14 hours a week and make $5.50 an hour. which job will allow her to save the most money after 6weeks?