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MrRissso [65]
3 years ago
5

If point A, having

Mathematics
1 answer:
Ronch [10]3 years ago
4 0

gradient or slope=<u>y2 -y1</u>

x2 - x1

so for A, p is x1 and 3 is y1..

For B, 6 is x2 and p is y2

2= <u>p - 3</u>

<u> </u><u> </u><u> </u><u> </u><u> </u>6 - p

2 ( 6 - p) = p - 3

12 - 2p = p - 3

-2p + p = -3 - 12

-p = - 15

p = 15

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Answer:

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Step-by-step explanation:

First, of all, let x be the amount of 5% solution used

Since, the scientist needs 10 L of solution, then;

Let 10 - x be the amount of 40% solution used

Now, we are told that she needs 10 L of a 20% acid solution.

This means that;

5%x + 40%(10 - x) = 20%(10).

Simplifying this gives;

0.05x + 0.40(10 - x) = 0.20 × 10

Expanding the bracket gives;

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Since 10 - x be the amount of 40% solution used , then;

the amount of 40% solution = 10 - 5.7 = 4.3 litres

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