How do u do this graph ?

In the coordinate plan (-6,9) b (3,9) c (3,3) def is shown in the coordinate plan below

Which math sentence can be used to determine if the triangle is a right triangle?

Someone answer asap for ! the following statements are true about the coins calvin and sasha have collected. * calvin and sasha has the same amount of money. * calvin has only quarters. * sasha has dimes, nickels, and pennies * calvin has the same number of quarters as sasha has dimes. * sasha has $1.95 in coins that are not dimes. exactly how many quarters does calvin have?