The load l, in pounds, of a wheelbarrow is the sum of its own 42-lb weight and weight of the bricks that it carries

The question also states that each brick weighs 4 lb and ask to find 1) the function and 2) the total load if the wheelbarrow carry 20 bricks.

1) Function: weight of the wheelbarrow + weight of the bricks

call x, the number of bricks

f (x) = 42 + 4x

2) total load with 20 bricks

f (20) = 42 + 4 (20) = 42 + 80 = 122 lb