What is the soultion set for the open sentence with the given replacement set? 15-x=9, {5,6,7,8}

In stepmber, daniel and justin opened a business. during their first three months of business, their average monthly profit was $51. if during their first month, they lost $29, and during their second month, they gained $115, what was their profit or loss for their third plzzz i will give you 299 points

Find the solution on the interval [0, 2pi)

Geometry - finding area of regular polygons and sectors (check my math, i can’t find the error)