Mary bought a smart phone and has $11.43 left. how much did mary have before she bought the smart phone? write an equation and solve it by using the information in the table.

Find two rational expressions that have the difference of 2-n/n-4

Kayla wants to find the width, ab, of a river. she walks along the edge of the river 65 ft and marks point c. then she walks 25 ft further and marks point d. she turns 90° and walks until her location, point a, and point c are collinear. she marks point e at this location, as shown. (a) can kayla conclude that δ and δ are similar? why or why not? (b) suppose de = 15 ft. what can kayla conclude about the width of the river?

8litres of paint can cover 129.6 m². how much paint is required to paint an area of 243m²?