Marty flips a coin three times what is the chance that all three flips end up being heads

What is the greatest number of parts of a circle that can be formed by cutting the circle with 7 straight cuts? (note: the parts do not have to be equal in size)

Select the point that is a solution to the system of inequalities. y< =-x+3 y=x^(2)-3x

Which geometric principle is used to justify the construction below?