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Yuliya22 [10]
3 years ago
11

in 1990, the cost of U.S. stamp was 25 cents. In 2010, the cost of U.S. stamp was 44 cents. In 20 years, what was the percent of

increase in cost of stamps?
Mathematics
1 answer:
Drupady [299]3 years ago
5 0

Answer:

8

Step-by-step explanation:

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((2x^9)(y^n))((4x^2)(y^10))=(8x^11)(y^20)
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We are given

((2x^9)(y^n))((4x^2)(y^{10}))=(8x^{11})(y^{20})

Firstly, we simplify left side

Left side is

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we will make all x terms together

and y terms together

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we can multiply left side by using exponent rule

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Since, both sides have x,y and 8

and both are equal

so, their exponent must be equal

so, exponent of y must also be equal

we get

n+10=20

n=10................Answer



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