Must the sum of three polynomials again be a polynomial?

How many millimetrs are there in 4cm?

Which operation will "undo" subtraction? addition subtraction multiplication division

Joani has some stuffed animals. She has 2 times as many as Lily. Lily has 6 stuffed animals. Joanie gave 2 away and bought 4 more.

If 10% of a number is 7, what is 80% of the number?

The sum of 2 consecutive numbers is 37. Find the numbers.

What is the end behavior of the function f (x) = 2x^4 + 3x^3 - 9x^2 + 65x - 586?

I'm trying to solve 2x^2+3x=2

Suppose that a company claims that its batteries last 240 hours on average. It took many large samples, and each time the mean number of hours was outside the 95% confidence interval.

Sam added two fractions together and got 7/8 as the answer. Write down two fractions that Sam could of added.

A sign language club made $627.50 from selling popcorn at a festival. The popcorn cost the club $95.00. Which expression represents the amount of money that was raised for each member of the club?