If 30 marks is 40% what is full marks?

Asporting good store is offering 30 percent off of the original price(x) of football cleats. the discount will be reduced by an another $7 before sales tax.

The curved part of the figure is the semicircle what is the best approximation for the area of this figure

Describe a situation where it would be beneficial to round decimals to the nearest dollar. explain why you would use rounding in that situation.