I need help answering these problems. Please help me by answering and showing explanations.

Question 7 2 pts Let X be uniformly distributed between [2, 4] and Y be uniformly distributed between [3, 5]. X and Y are independent. Then, evaluate the following: a)P(Y2X+1)= [Select] V b)P(Y2 X) = [Select] v Question 8 1 pts A gas station sells three grades of gasoline: regular, extra, and super. These are priced at $21.20, $21.35, and $21.50 per gallon, respectively. Let X1, X2, and X3 denote the amount of three grades purchased (in gallons} on a particular day. Suppose X1, X2, X3 are independent with mean values as 1000, 500, and 300 respectively, and standard deviation as 100, 80 and 50 respectively. 1) The expected revenue from the sale is [59'3\"] V dollars 2) The standard deviation of the revenue from the sales is [59'9\"] V dollars