A certain trip was done in two legs.  The first leg was 30 miles long in one hour and the second leg was 60 miles in two hours. What is the average speed? this is a science question
S=D/T

Can some one me with these questions

Use mathematical induction to prove the statement is true for all positive integers n, or show why it is false. 1^2 + 4^2 + 7^2 + + (3n - 2)^2 = [n(6n^2-3n-1)/2]

Cheryl works as a hotel maid. the number of hotel rooms she cleans is directly proportional to the number of hours she works. the graph shows that r rooms are cleaned in t hours. using the graph below answer the following questions under it