Astore's cost for a stereo was $27. the markup was 75%. a customer purchased it on sale for 40% off. what was the purchased price of the stereo?

Zoe placed colored blocks on a scale in science class. each block weighed 0.8 ounces. the total weight of all the colored blocks was 12.8 ounces. how many blocks did zoe place on the scale? write and solve an equation to find the answer.

What are the constants in this expression? -10.6+9/10+2/5m-2.4n+3m

Aquadrilateral has exactly one pair of parallel sides. which name best describes the figure?