What is the equation of a line that passes through the point (2,7) and is perpendicular to the line whose equaton is y=x/4 +5

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

7x+8y=-18, 4x-9y=-3 solve the system of equations

Tabby sells clothing at a retail store, and she earns a commission of 6.25% on all items she sells. last week she sold a pair of jeans for $32.50, a skirt for $18.95, and 2 blouses for $14.95 each. what was tabby's total commission? a $4.15 b $5.08 c $81.35 d $348.60