"17 less than" implies subtraction of the product of 3 and m, so the equation would be, if solving for x:
x=3m-17
6(2 + 5t) = 6*2 + 6*5t = 12 + 30t
Answer is 12 +30t.
When finding the mean you add up the numbers that are needed to find the mean and divide them by the amount of numbers you added. For example question 5 you will add 58+58+62+55+49+48 which will equal 330 and then divide it by 6 because there are 6 numbers which is 55.
You have to divide 20and 4 which your answer would be 5
