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rusak2 [61]
3 years ago
14

Find the value of x. 3x + 45 = 90

Mathematics
1 answer:
seropon [69]3 years ago
8 0
3x + 45 = 90
3x = 90 - 45
3x = 45
x = 45/3
x = 15
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This recipe makes 10 portions of porridge.
tankabanditka [31]

Answer:

245g of oats

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49g of sugar

Step-by-step explanation:

350÷10=35

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Step-by-step explanation:

5 0
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If the perimeter of A rectangle is 70" in and the length is 11" in more than its width find the area of the rectangle
steposvetlana [31]
First, write an equation system based on the problem
An equation for "the perimeter of a rectangle is 70 in" can be written as following
∴ 2l + 2w = 70  <em>(first equation)</em>
An equation for "the length is 11 in more than its width" can be written as following
∴ l = w + 11 <em>(second equation)</em>

Second, solve the equation by substitution method o find the dimension of the rectangle.
Substitute/plug l as (w+11) into the first equation
2l + 2w = 70
2(w + 11) + 2w = 70
2w + 22 + 2w = 70
4w + 22 = 70
4w = 70 - 22
4w = 48
w = 48/4
w = 12
The width of the rectangle is 12 in

Substitute w with 12 to the second equation
l = w + 11
l = 12 + 11
l = 23
The length of the rectangle is 23 in

Third, find the area of the rectangle
a = l × w
a = 23 × 12
a = 276
The area of the rectangle is 276 in²
4 0
3 years ago
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