What is the distance between (-1,4) and (5,4)? Draw a line connecting the points. This is a ??? Line

Express the following as a function of a single angle. cos(60) cos(-20) - sin(60) sin(-20)

1) prove that 731^3−631^3 is divisible by 100 2) prove that 99^3−74^3 is divisible by 25

How many heads would you expect if you flipped a coin twice? first, fill in the table below with the correct probabilities. hint: the sample space for flipping a coin twice is {hh, ht, th, tt}. a = b = c = f