i am having much trouble with this problem and have tried to solve it several ways.

For the home described in exercise 15 (listed below as per equation),; if the roof is 7m from peak to eave and the attic space is 3m high at the peak, how long does each of the piecesof insulation need to be? Round to the nearest tenth.

(exercise 15; a homeowner wishes to insulate her attic with fiberglass in sulation to conserve energy. The insulation comes in 40-cm wide rolls that are cut to fit between the rafters in the attic. if the roof is 6m from peak to eave and the attic space is 2m high at the peak, how long does each of the pieces of insulation need to be? Round to the nerest tenth.)