Use quadratic formula and plz show work

Carl wants to buy a television that cost $500 including taxes. to pay for television he will use a payment plan that requires him to make a down payment of $125 and then pay $70.50 each month for six months what is the percent increase from the original cast of the television to the cost of the television using a payment plan.

Arandom number generator is used to model the patterns of animals in the wild this type of study is called

Find the value of the cosine for angle a