Griffin ordered a pair of sneakers online. he had a $19 credit that he applied toward the purchase, and then he used a credit card to pay for the rest of the cost. if the shoes cost $86, how much did griffin charge to his credit card when he bought the sneakers? a.$48 b.$67 c.$124 d.$105

Pls! does anybody know a shortcut for answering these types of questions in the future?

Suppose that the price p (in dollars) and the weekly sales x (in thousands of units) of a certain commodity satisfy the demand equation 4p cubedplusx squaredequals38 comma 400. determine the rate at which sales are changing at a time when xequals80, pequals20, and the price is falling at the rate of $.20 per week.

Me solve this problem, and someone clearly explain to me how to solve it.1.) use the value of the discriminant to determine if the given trinomials has 2 real solutions, 1 real solution, or no real solutions.a.  x2  − 4x  − 7 = 0b. 4r2  + 11r  − 3 = 0c. 3m2  + 7 = 0d.  t2  + 2t  + 1 = 0