If a coin is tossed 3 times, what is the probability that it will come up tails one or more times?

Hello people, i have a math question that i need with, me, i will give the correct one brainiest, and for the other correct people, a and 5 stars.

An engineer scale model shows a building that is 3 inches tall. if the scale is 1 inch = 600 feet, how tall is the actual building?

Determine the area of a triangle with (see picture below)