3.2 Evaluating Formulas
Presentation
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Mathematics
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7th Grade
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Practice Problem
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Easy
Standards-aligned
Elizabeth Nixon
Used 2+ times
FREE Resource
5 Slides • 4 Questions
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We have learned that the area of a rectangle is given by: Area = length x width
If we use A to represent area, l to represent length and w to represent width, we get A = lw
Connecting 2 or more variables in this way is called a formula. When we know the values of l and w, we can find the value of A using substitution.
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Multiple Choice
Try It: The perimeter, P meters, of a rectangular field with dimensions l meters by w meters, is given by the formula: P = 2( l + w ). Find the perimeter of a rectangular field whose dimension is 60 meters by 45 meters.
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Multiple Choice
Try it a: Given the formula D=21n(n−3) , find the value of D when n = 5
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Multiple Choice
Try it b: Try it a: Given the formula D=21n(n−3) , find the value of D when n = 12
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Multiple Choice
Try it: If s=2av2−u2 , find the value of s when u = 3, v = 12 and a =6.
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