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RoseWind [281]
3 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]3 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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PtichkaEL [24]

If you want to solve \dfrac{a}{b} = c for b, start by getting rid of the fraction.  

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    a = b\cdot c

Now this is a regular old equation without fractions.  To get b by itself, you need to divide away c from both sides of the equation.

Can you finish it from there?

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3 years ago
Ritz can eat 8 apples in 15 minutes.how long does it take ritz to eat 16 apples at the same rate.
zhannawk [14.2K]
We can answer the problem using a rule of three, simple, direct proportion and also using fractions. First the rule of three:
8 apples ------> 15 min
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x = (16)(15)/8
x = 30
therefore he can eat 16 apples in 39 minutes.

We can also equate fractions like so:
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the same answer
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4 years ago
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Which of the following shows the length of the third side, in inches, of the triangle below?
Tju [1.3M]
<span>70 inches is right-josh

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3 years ago
Driving to your friend's house, you travel at an average rate of 35 miles per hour. On your
Mamont248 [21]

Answer:

14 miles.

Step-by-step explanation:

Let the distance traveled from home to destination = x miles.

Speed while going to friend's house = 35 miles per hour.

Speed while coming back = 40 miles per hour.

Total Time taken for the journey = 45 minutes = 0.75 hours.

Let the time taken while going to friend's house = y hours.

Therefore, the time taken while going to friend's house = (0.75 - y) hours.

To find x and y, model the speeds of both the journeys.

Speed while going to friend's house = Distance/Time.

35 = x/y.

x = 35y (Equation 1).

Speed while coming back = Distance/Time.

40 = x/(0.75 - y).

x = 40(0.75 - y) (Equation 2).

Since x = x, therefore:

35y = 30 - 40y.

75y = 30.

y = 30/75.

y = 0.4 hours.

Put y = 0.4 hours in Equation 1:

x = 35y.

x = 35(0.4).

x = 14.

Therefore, the distance between my friend's house and my house is 14 miles!!!

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4 years ago
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Given the fuction h (x) = x^2 + 2x -3, find the value of h (2) - h (-4)
Anettt [7]

Answer:-

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Step-by-step explanation:

h(x) = x^2 + 2x -3

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h(-4) = 16 - 11

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========

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