A sign says that the price marked on all music equipment is 40% off the original price. You buy a drum set for the sale price of $870. What is the original price? How much money did you save off the original price of the drum set? What percent of the original price is the sale price?

the area of a triangle is determined by the formula: base x height * 1/2

you'll need to assign a base to the triangle. based on the vertices given, the simplest base would be the line segment from (-2,1) to (2,1). the distance between any two numbers is found by just subtracting them. here, you should subtract the x values to find the distance of this side.

2 - (-2) = 4.

so the distance (aka the length of the base) is 4. the height of the triangle is the distance between the base and the highest point on the triangle which is (3,4). we should subtract the y values this time to find the height/distance.

4 - 1 = 3

so the height is 3.

base = 4

height = 3

hope this if needed hmu

the one where 1 and 2 are directly across from each other.  

see image