All of the following expressions have the same value except: 15 ÷ -5 - (-15) ÷ (-5)

In the diagram below, dab and dac are adjacent angles. if mdac = 25°, what is mdab in degrees? what is mbac in degrees?

How do i simply this expression (quadratic formula basis) on a ti-84 or normal calculator?

Amanda went into the grocery business starting with five stores. after one year, she opened two more stores. after two years, she opened two more stores than the previous year. if amanda expands her grocery business following the same pattern, which of the following graphs represents the number of stores she will own over time?