An advertisement claims that 7 out of 8 people prefer Brand X. Suppose 216 people were interviewed.
Find the number of people who prefer Brand X.

Pls the last one and it has to be like number 6

You are saving to buy a bicycle; so far you save 55.00. the bicycle costs 199.00. you earn 9.00 per hour at your job. which inequality represents the possible number of h hours you need to work to buy the bicycle?

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]