How do i find the percent of 38% of 50

Before simplifying, how many terms are there in the expression 2x - 5y + 3 + x?

The linear combination method is applied to a system of equations as shown. 4(.25x + .5y = 3.75) → x + 2y = 15 (4x – 8y = 12) → x – 2y = 3 2x = 18 what is the solution of the system of equations? (1,2) (3,9) (5,5) (9,3)

Plzzz answer both questions and i will give you 100 points