How can you find 10% of a number in your head

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.

If two parallel lines are cut by a transversal, interior angles on the same side of the transversal are supplementary. a. always b. sometimes c. never

The table showed price paid per concert ticket on a popular online auction site. what was the average price paid per ticket