First one is
2x where x equals number of people in your class
second one is
money saved = 1/2y+6 where y equals amount of money in pay check
Divide the arrow into upper triangle and lower rectangle
area of triangle :-


area of rectangle :-

add both the area :-
area of triangle+ area of rectangle = area of arrow
310 + 300 = 610 cm²
S < 20 , -5x > -100 , etc