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raketka [301]
2 years ago
11

What is the value of y when y + 2.9 = 11?

Mathematics
1 answer:
aalyn [17]2 years ago
3 0

Answer:

y=8.1

Step-by-step explanation:

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The length of a rectangle is 4 centimeters less than twice its width. The perimeter of the rectangle is 34 cm. What are the dime
yarga [219]

Let l and w be the length and width of the rectangle. We know that l=2w-4

The formula for the perimeter is P=2(w+l)

Using our substitution, it becomes

P=2(w+2w-4)=2(3w-4)=6w-8

We know that the perimeter is 34, so we have

6w-8=34 \iff 6w=42 \iff w=7

The length is 4 less than twice the width, so we have

l=2\cdot 7 - 4 = 10

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24 would be your answer

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Simplify -r+8(-5r-2)
Lapatulllka [165]

<u>Answer:</u>

<em>  -41r - 16</em>

<u>Step-by-step explanation:</u>

<em>Step  1  :</em>

<em>Step  2  :</em>

<em>Pulling out like terms :</em>

<em> 2.1     Pull out like factors :</em>

<em>   -5r - 2  =   -1 • (5r + 2) </em>

<em>Equation at the end of step  2  :</em>

<em>  -r +  -8 • (5r + 2)</em>

<em>Step  3  :</em>

<em>Step  4  :</em>

<em>Pulling out like terms :</em>

<em> 4.1     Pull out like factors :</em>

<em>   -41r - 16  =   -1 • (41r + 16) </em>

6 0
3 years ago
A triangular pennant has two sides that are 90 cm long each with an included angle of 25°.
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Hmph... 

The area is 1,711.67 cm².. 

Love, grace..-

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4 years ago
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The basement of a large department store features discounted merchandise. Their policy is to reduce the previous month's price o
Marizza181 [45]
Thank you for posting your question here at brainly. I hope the answer will help you. Feel free to ask more questions.
 <span>P(t) = Po(1 - r)^t 

P(t) = price after t months --> S 
Po = initial price -- P 
r = rate as a decimal 

S = P(.9)^4 
-> = 100(.9)^4 
-> = 65.61 

(100 - 65.61)/100 
34.39/100 
34%</span>

5 0
3 years ago
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