Can someone help me solve number 34 please with explanation

Answer + 34. Roof Area A barn is 100 feet long and 40 feet wide (see figure). A cross section of the roof is the inverted catenary y = 31 - 10 (ex/20 4 e-z/20). Find the number of square feet of roofing on the barn. y =31 - 10(ex/20 + e-x/20) 20- 100 ft X -20 20 35. Length of Gateway Arch The Gateway Arch in St. Louis, Missouri, is closely