Describe what it means for a number to be a solution to an equation. Determine the solution to the equation

Expresa commuter train leaves downtown sation and travels at a average speed of 55 miles per hour towards the north side sation, which is 50miles away. thirty minutes later, express commuter train #7 leaves north side and travels at a average speed of 35miles per hour towards downtown sation. at the moment the two trains pass each other, how far(in miles) is train #12 from the downtown sation and how long(in minutes) has the #12 train been traveling

What happens to the area as the sliders are adjusted? what do you think the formula for the area of a triangle is divided by 2?

Typically a point in a three dimensional cartesian coordinate system is represented by which of the following answers in the picture !