Iwill give ! i beg somebody to me !

what is the slope of this line?

a) -1/4
b) 1/4
c) -4
d) 4

See attachment below and find the equivalent of tan(∠qsr)

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?

Tan198=asin164=? how to solve this? ?