COURSE 3 LESSON 4-6 Formulas

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Presentation transcript:

COURSE 3 LESSON 4-6 Formulas Find the area of a trapezoid with height of 6 cm and bases of 5.2 cm and 7.5 cm. A = h (b1 + b2) Use the formula for the area of a trapezoid. 1 2 = (6.0) (5.2 + 7.5) Substitute. 1 2 4-6

Formulas (continued) = (6.0)(12.7) Add within the parentheses. COURSE 3 LESSON 4-6 Formulas (continued) 1 2 = (6.0)(12.7) Add within the parentheses. = 3(12.7) Multiply from left to right. = 38.1 Simplify. The area of the trapezoid is 38.1 cm2. 4-6

COURSE 3 LESSON 4-6 Formulas Find the time it takes a sled-dog team to go 95 miles if their average rate is 19 mph. The problem gives distance and rate. Use the distance formula, d = rt where d is the distance traveled, r is the rate of travel, and t is the time spent traveling. d = rt Use the distance formula. 95 = 19 • t Substitute 95 for d and 19 for r. Divide each side by 19 to isolate t on the right. 95 19 19 • t = 5 = t Simplify. 95 19 t = It took the sled-dog team 5 hours to go 95 miles. 4-6