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vlada-n [284]
3 years ago
9

4. A scientist changes the temperature of a solution at a rate of -7°C per minute. How many minutes will it take for

Mathematics
1 answer:
igomit [66]3 years ago
6 0

Answer:

7 minutes

Step-by-step explanation:

The scientist changes the temperature for the solution at a rate of -7°C per minute. We need to find out how long it'll take for the solution's temperature to change from  0°C to -49°C. So, we divide -7 by -49 to find out how long it will take:

-49 / -7 = 7

It will take 7 minutes for the temperature to reach -49°C.

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If y=8 when x =3, find y when x=45
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Let's make things easier by simplifying things.

y = 8 and x = 3 is more likely to be understood as a ratio. So for the rest of the answer, their relationship would be represented as y:x

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The problem would be finding y when x = 45

Let us proceed on using the previous equation and substitute x with 45 which would look like this:

y:45 = 8:3

Ratios can also be expressed as fractions which would make things more understandable and easy to solve. So the new form of our equation would be like this:

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Then we proceed with a cross multiplication where the equation becomes like as what is shown below:

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From there, you can solve it by multiplying 45 and 8 then dividing the product with 3 to get y

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Another way of looking at the problem, especially problems like these, is to take the whole question or statement as an equation. it would probably look like this:

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