What are these numbers in standard form?

6.5 ×10 to the 3rd power

4 ×10 to the −5 power

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?

Find the values of the variables in the kite

Nine people are going to share a 128-ounces bottle of soda. how many ounces will each person get drink? choose the correct equation and answer for this situation