:( 20 points

solve for b.

b+0.6=−1

what is the answer?
a) b=−1.6
b) b=−0.4
c) b = 0.4
d) b = 1.6

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?