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# 8th-grade #

: 20 points :

"ANSWER BOTH 2 QUESTIONS, OR WILL BE REPORTED"

Adepartment store purchases screen-printed t-shirts at a cost of $5 per shirt. they mark up the price 150% (making the selling price 250% of the store's purchase price) and put them on the sales floor. every month that a t-shirt doesn't sell, the store reduces the selling price by 25%.

Select all the correct answers. what is 221,000,000,000,000,000,000 expressed in scientific notation?

What is the difference between the equations of a vertical and a horizontal line?