Can someone pls answer this it will be a big help thx

Tom drove 206 miles in 3.9 hours. estimate his average speed.

Solve the formula ax+ by = c for x.

Me its important ! marge runs an ice cream parlor. her speciality is triple chocolate sundaes.she can prepare 1 sundae every 2 minutes, and she earns $1.20 for each sundae she makes . if she just makes sundaes for a single shift of at most 4 hours and at least 2 hours , which function relates her earnings to the number of minutes she works?