Last week Sarah lost' 6.25 pounds but this week she gained 4.6 pounds. What was her overall weight change?

What is the value of x in the diagram below?

Which expression is equivalent to -12(3x-3/4)

The floor of a building consists of 3000 tiles which are rhombus shaped and each of it's diagonals are 45 cm and 30 cm in length. find the total cost of polishing the floor, if the cost per m² is rs. 4.