Complete the following proof. (Note: Your teacher has additional instructions on how to complete this problem, if needed.) Prove: In an isosceles triangle two medians are equal.

Donald has x twenty-dollar bills and 11 ten-dollar bill. how much money does donald have? write your answer as an expression.

Three numbers x, y, and z are in the ratio 2: 7: 8. if 12 is subtracted from y, then three numbers form a geometric sequence (in the order x, y–12, z). find x, y, and z. there are 2 sets.

Find the distance between (7,-6) and (-3,-9)