A cyclist travels 3 miles in 45 minutes. What is his average speed in mph?

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%.

Which of the following expressions is equal to 2x^2+8

Given abcd ac=38 and ae=3x+4 find the value of x