Calculate the mean of: 4.6, 3, 8.1, 9, 12, 3, 9, 3.5, 7, 3

Can someone me do math because i am having a breakdown rn because i don’t get it

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]

Jahdzia wears her winter coat when the temperature is colder than -4 degrees celsius. write an inequality that is true only for temperatures (t) at which jahdzia wears her winter coat.