4xy - 7y + 9xy + 12y I don't know how to do this and I'm getting bad grades because of this how to combine like terms

12+9 over three to the second power

What is the sum of (x^2+6x-5) + (2x^2+15)

A menu offers a choice of 2 salads, 6 main dishes, and 5 desserts. How many different meals consisting of one salad, one main dish, and one dessert are possible?

Eva is buying Comet Goldfish to add to her aquarium. Each fish costs $0.21, and Eva has $3.00. Which of these represent the inequality and/or solution for how many Comet Goldfish Eva can buy?

What layer in the atmosphere has the greatest depth and how deep is it?

A rectangular park has an area of 64 square yards. If we multiply its length and width by 12, what will be the area of the new rectangle?

A town uses positive numbers to track incresses in population and negitive numbers to track decresses in population. The population had decressed by 300 residents over the past 5 years. The same numbers of residents left each year.

What are the steps of translating 2 or 1 step expressions?

How to solve this equation-1/2 a+3b-b+9

How do you Evaluate |-a2|, given a = 5, b = - 3, and c = - 2