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RoseWind [281]
2 years ago
9

Sadie computes the perimeter of a rectangle by adding the length, l , and width, w , and doubling this sum. Eric computes the pe

rimeter of a rectangle by doubling the length, l , doubling the width, w , and adding the doubled amounts. (a) Write an expression for Sadie's way of calculating perimeter. Write a different expression for Eric's way. (b) Use both of the expressions to find the perimeter of a rectangle with length 30 and width 75.
Mathematics
1 answer:
larisa [96]2 years ago
4 0

a) P = 2(l+w)  Sadie

 P =2l+2w  Eric

b)  Sadie : P = 2(30+75) = 2(105) = 210

Eric: P = 2(30) +2(75) = 60+150 =210

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Answer:

3.349 \times {10}^{ - 10} \:  {mm}^{3}

Step-by-step explanation:

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WINSTONCH [101]

Answer:

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Step-by-step explanation:

The given system of equation is presented as follows;

5·a + 5·b = 25...(1)

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Given that the coefficient of a in equation (1) is equal in magnitude but opposite in sign to the coefficient of 'a' in equation (2), to eliminate the variable 'a' when using the elimination method, we add both equations as follows;

5·a + 5·b + (-5·a + 5·b) = 25 + 35 = 60

5·a - 5·a + 5·b + 5·b = 60

5·a - 5·a = 0

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Brilliant_brown [7]

Answer:

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Plus, you can see that the angle forms a perfect 90 degree angle.

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