Find the percent change in price

a. a prices increases from $12 to $15 and

b. a price descreases from $20 to $12

A cafeteria worker who fails to wash his hands thoroughly and fails to wear gloves inoculates a quiche with 4 E. coli when he uses his finger to test whether it is done. By the time you purchase the quiche, there are 128 E. coli cells in it.

what is the rate of discount on a DVD player having a marked price of $240 but sold for $216 pleas show work

A store is having a sale on jelly beans and almonds. For 2 pounds of jelly beans and 5 pounds of almonds, the total cost is $10. For 8 pounds of jelly beans and 3 pounds of almonds, the total cost is $23.

Given that a triangle has two sides of lengths 5 inches and 7 inches, which is a possible length of the third side? 3 inches 2 inches 12 inches 13 inches

Katie has her mom ribbon that is 8 feet long he cuts of 3 feet of ribbon and the remaining length is cut into8 pieces of equal length what is the length of each shoulder piece of ribbon

Write a statement that declares a reference variable abend suitable for holding a reference to an Exception object and initialize it to an Exception object whose message is "ABEND 013".

The figure is composed of 2 congruent triangles and a rhombus.

Carla has a credit card that uses the average daily balance method. For the first 15 days of a 31-day billing cycle, her balance was $2560, but then she paid off her entire balance and didn't make any new purchases.

The expression x^2 + x + b is a perfect square trinomial. What is the value of b?

Solve the equation by factoring: 3x^2 + 22x - 16 = 0