Find the sum between (-x + 7y + 2z) and (4x – 9y).

The depth of a lake at a certain point, wich is a function of the distance of that point from shore, is 30 feet.

To solve the system of equations below, grace isolated the variable y in the first equation and then substituted into the second equation. what was the resulting equation? 3y=12x x^2/4+y^2/9=1

Sarah used her calculator to find sin 125 degrees. she wrote down sin sin125 degrees.57. how could sarah recognize that her answer is incorrect?