Can someone plz answer number 9 a and 9 b?

During a bike challenge riders have to collect various colored ribbons each 1/2 mile they collect a red ribbon each eighth mile they collect a green ribbon and each quarter mile they collect a blue ribbion wich colors of ribion will be collected at the 3/4 markrer

25 ! the line of best fit is h = 5a + 86. predict the height at age 16. show your work.

Convert the mixed numbers into improper fractions. convert the improper fraction to mixed numbers.