Supply the missing reasons for the proof below

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?

15m is what percent of 60m; 3m; 30m; 1.5 km? the last one is km not m

For each sentence below, find the value of x that makes each sentence true. (515) 5 = 25* x= (813)2 = 4* x=