A construction crew lifts approximately 680 lb. of material several times during a day from a flatbed truck to a 34 ft rooftop. A block and tackle system with 50 lb. of effort force is designed to lift the materials. How many supporting strands will be needed in the pulley system?

An architect builds a model of a park in the shape of a rectangle. the model is 40.64 centimeters long and 66.04 centimeters wide. one inch equals 2.54 centimeters. use the ratio table to find the ratio of the length to the sum of the length and width in inches and in simplest form. length 40.64 width 66.04 a. 8: 21 b. 13: 21 c. 21: 13 d. 21: 8