4. X = {10, 20, 30, 40} and Y = {1,2,3,4}. X Y (a) Copy and complete the Venn diagram. (b) List the elements of XU Y. (C) List the elements of X n Y. (d) What is #(XU Y)? (e) What is #(X n Y)?

The ratio of two numbers is 5 to 4. the sum of the numbers is 99. what number is the greater of the two numbers?

Marco has $38.43 dollars in his checking account. his checking account is linked to his amazon music account so he can buy music. the songs he purchases cost $1.29. part 1: write an expression to describe the amount of money in his checking account in relationship to the number of songs he purchases. part 2: describe what the variable represents in this situation.

If the ratio of sum of the first m and n terms of an ap is m2 : n2 , show that the ratio of its mth and nth terms is (2m − 1) : (2n − 1).