$28.45
Step-by-step explanation:
We need to find the area of the patio. The patio is rectangular in shape:

We are told 59 square feet of paint cost $11.99
We need to find the cost of paint required to paint the patio
let the cost of 140 square feet of paint for the patio = y
59 ft² = $11.99
140 ft² = y
cross multiply:
y(59 ft²) = 140 ft² ($11.99)
ft²cancels out on both sides:
59y = 140 ($11.99)
59y = $1678.6
y = $1678.6/59
y = $28.45
Hence, the estimated cost for painting the concrete is $28.45