Chelsea is sitting 8 feet from the foot of a tree. From where she is
sitting, the angle of elevation of her line of sight to the top of the tree
is 36º. If her line of sight starts 1.5 feet above ground, how tall is the
tree, to the nearest foot?
(1) 8
(3) 6
(2) 7
(4) 4

Evaluate the discriminant of each equation. tell how many solutions each equation has and whether the solutions are real or imaginary. x^2 - 4x - 5 = 0

You are standing next to a really big circular lake. you want to measure the diameter of the lake, but you don't want to have to swim across with a measuring tape! you decide to walk around the perimeter of the lake and measure its circumference, and find that it's 400\pi\text{ m}400? m. what is the diameter dd of the lake?

If set d is not the empty set but is a subset of set e, then which of the following is true? d ∩ e = d d ∩ e = e d ∩ e = ∅