What property is 7/8+0=7/8?

What is the point-slope form of the equation for the line with a slope of -2 that passes through (1,4)?

What is the value of x? enter your answer in the box. (cm)

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%.