What is the slope between the points (-5,-1) and (-8,3)

Can someone me with these two circle theorem questions asap?

Will mark the brainliest. paula makes stained-glass windows and sells them to boutique stores. if her costs total $12,000 per year plus $4 per window for the frame. how many windows must she produce to earn a profit of at least $48,000 in one year if she sells the windows for $28 each?

What are two numbers that have a sum of 15?