Can someone please help me i dont understand this at all and no one in my family knows this stuff

The lines shown below are parallel. if the green line has a slope of -1, what is the slope of the red line?

Asphere has a diameter of 10 in. what is the volume of the sphere?

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