Factor each polynomial using gcf

18c to fourth power-9csquared+7c

Molly shared a spool of ribbon with 12 people. each person received 3 feet of ribbon. which equation can she use to find r, the number of feet of ribbon that her spool originally had?

Anyone? 15m is what percent of 60m; 3m; 30m; 1.5 km?

Angles r and s are complementary. the measure of angle r is 31 degrees. which equation can be used to find angle s?