How many ziros in the number 1.8e10?

20 points! asap! a is known to be 6,500 feet above sea level; ab = 600 feet. the angle at a looking up at p is 20°. the angle at b looking up at p is 35°. how far above sea level is the peak p? find the height of the mountain peak to the nearest foot. height above sea level =

Which ordered pair (c,d) is a solution to the given system of linear equations- c+2d=13 -9c-4d=-15

What are the solutions of the system? solve by graphing. y = -x^2 - 3x + 2 y = -2x + 2