find the expected value of the winnings from a game that has the following payout probability distribution. Pls help

To solve the system of equations below, grace isolated the variable y in the first equation and then substituted into the second equation. what was the resulting equation? 3y=12x x^2/4+y^2/9=1

The interior angles formed by the side of a hexagon have measures of them up to 720° what is the measure of angle a

In a two-digit number the units' digit is 7 more than the tens' digit. the number with digits reversed is three times as large as the sum of the original number and the two digits. find the number.