Identify the following expression as variable o numerical 18+15y-10

A train leaves Philadelphia at 3 PM. The second train leaves the same city in the same direction at 9 PM. What is the speed of two trains?

8*10^4 is how many times as big as 4*10^-5

I don't know how to fine the square root

How to simplify? 2 (-3x^2+6x+1) - 2 (4x^2-3x+1)

What value of x is in the solution set of 8x - 6 > 12 + 2x?

A group of friends ordered two pizzas, one with pepperoni and one with mushrooms and green peppers. A plain pizza costs 9 dollars. Each extra topping costs 1 dollar. How much did the two pizzas cost?

The sum of four consecutive integers is 358. Find the four integers.

Student enrollment at a local school is concerning the community because the number of student has dropped to 504 which is a 20% decease form the previous year. what was the student enrollment the previous year?

The difference between 8 and 3 subtracted from 15

Regular rides cost 3 tickets and children's rides cost 1 ticket. Find three solutions of 3x + y = 12 to find the number of regular rides x and children's rides y a family can go on with 12 tickets. Explain each solution.