Help me with number 6, 8, 10 pls

Toyland is having a sale. all items are 20% off. how much will you save on an item that usually sells for 95$ explain your

Which of the following would be a reasonable estimate for the weight of a pencil? a. 1 × 10^-20 lb b. 1 × 10^20 lb c. 1 × 10^2 lb d. 1 × 10^-2 lb

Y= 4x + 3 y = - 1 4 x - 5 what is the best description for the lines represented by the equations?