How do u know if a equation is linear or nonlinear

Sally has a few choices for lunch:a hamburger, hot dog, or BBQ, With French fries, piero gives, or chips. How many different are there to choose from

Mr. Plum's math class of 25 students had an average of 85 on a test. Miss Scarlett's class of 22 students had an average of 87 on the same test. What is the average of the two classes combined?

There are 321 visitors at the library. Each library table seats 12 people. How many tables are needed to seat all of the visitors? (Explain the process of how you got your answers)

For every one litre of water used to make medicine, 199ml of sucrose and 271ml of saline solution are used. Express the amount of water, sucrose and saline solution needed as a ratio in its simplest form.

Which is the constant term of the algebraic expression - 2x 2+17-15x+xy

What is the equation of the axis of symmetry for the parabola y=-1/2 (x+3) ^2-5

Original price: $92 Discount: 10% Sale price:?

Which expression is equal to 4^2 ⋅ 4^8?

Why is it so easy to buy on impulse and overspend with a credit card? What could you do to counteract this tendency?

Find the height of a square pyramid that has a volume of 12 cubic feet and a base length of 3 feet