I need help with this but can’t figure out what the answer is

Three coins are flipped. what is the probability that there will be at least two tails?

Which of the following is a justification used while proving the similarity of triangles lom and mon

The weight of an object in a particular scale is 175.2 lbs. the measured weight may vary from the actual weight by at most 0.1 lbs. what is the range of actual weights of the object