2u+7u=81 simplify your answer as much as possible

How do you solve a proportion? (Like not how To but What do i do Because the question Is how do you solve a proportion.)

Which one is the heaviest, 1mg, 1mcg, 1g, or 1kg

The perimeter of a rectangle is 30 inches. Its length is three times its width. Write an equation to represent the problem

Find all the natural numbers, which when divided by 7, leave the same number for the quotient and the remainder.

How many terms does the polynomial 7x^ (2) - 5x+2 have?

Jessica went shopping for a new watch she found a watch that was originally priced at $50 on sale for $40 by what percent had the watch been marked down A. 10% B. 20% C. 25% D. 40%

What is the answer? Trying to figure out which way to start! 4 + (9x2) / (4-1) - 4

A model to represent the product 18*34

Write the simplest form of a rational number 177/413

Use substitution to solve the system x+2y=1 and 2x+5y=3