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Alekssandra [29.7K]
3 years ago
10

The function y varies directly as x, and y = 81 when x = 45. What is the value of x when y = 18?

Mathematics
1 answer:
NikAS [45]3 years ago
7 0

Answer:10

Step-by-step explanation:

9/5=18/x

90=9x

X=10

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Step-by-step explanation:

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The negative sign in 15t-2t belongs to the term____?
alexdok [17]

The expression 15t – 2t not equivalent to 2t – 15t because the negative sign in 15t – 2t belongs to the term 2t.

Solution:

Given expressions are 15t – 2t and 2t – 15t.

To determine 15t – 2t is equivalent to 2t – 15t or not.

Substitute t = 2 in above two expressions.

15t – 2t = 15(2) – 2(2)

            = 30 – 4

            = 26

2t – 15t = 2(2) – 15(2)

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            = –26

The values of the expressions are different when t = 2.

So, 15t – 2t is not equivalent to 2t – 15t.

Hence the expression 15t – 2t not equivalent to 2t – 15t because the negative sign in 15t – 2t belongs to the term 2t.

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