What is an algebraic expression for each phrase? a- the product of 9 and a number 1 b- the difference of a number x and 1/2 c- the sum of a number m and 7.1 d- the quotient of 207 and a number m

Idon’t understand this.. will someone ? will mark brainliest along with 20 points.

"princess tower" in dubai is considered the world's tallest residential building, towering to 1 0 1 101 floors! t ( n ) t(n) models the number of tenants living on floor n n of the tower. what does the statement t ( 2 0 ) = t ( c ) t(20)=t(c) mean?

Compare the subtraction problems 6/8 - 5/8 = 1/8 and 6/9 - 7/9 = 1/9 why is the answer to the first problem positive and the answer to the second problem negative