The percent of discount is 70%.
The sales tax is 2$ Hope this is the answer you're looking for.
Step-by-step explanation:
2y+9= 4
2y=-5
y=-5/2
y= -2and 1/2
And because we know that we cut the base of the equilateral triangle in half, we can see that the side opposite the 30° angle (the shortest side) of each of our 30-60-90 triangles is exactly half the length of the hypotenuse.
