What rate of interest earned 2800 as an interest on a sum of 28000 in 2 years

Kevin is an insurance salesman. when he sells a policy, he makes 20 percent of the policy premium (p) up front; then each year the policy is active, he receives 15 percent of the original premium. which equation could be used to figure his total commission on a policy that has been active for five years? c=0.80p c=0.20p + 0.15p c=0.35p + 4(0.15) c=0.95p

Christina can paint 420 square feet in 105 minutes. which unit rate describes the scenario?

How many sides does a regular polygon have if each exterior angle measure is 45 degrees explain your answer, i really don't understand this.