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3 years ago

1. Safia is stuck on the math question below. She doesn't quite understand what the question is asking, but

1 answer:

7 0

Answer: equivilent means equal to ans expression mean the statement with no answer. So the strategy Safia should use is to evaluate(solve) the Expression ans the expression is most likely equal to somwth8ng else so you already know the answer, you just have to solve for x.

Explanation:

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John is 4 years older than Marie. In ten years, he will be twice as old as Marie. How old is Marie now?

romanna [79]

If he is 4 now is in 10 years he will be 14 and if you multiply that by 2 you get 28 which means in 10 years Marie will be 28 so that means if you take away 10 the answer should be 18 but that isn't there but that's how I would work it out.

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3 years ago

Newton’s law of cooling states that for a cooling substance with initial temperature t0, the temperature t(t) after t minutes ca

antoniya [11.8K]

The cooling rate of the substance is approximately 0.0732.

According to the statement, the Newton's law of cooling is defined by the following formula:

$T(t) = T_{s} + (T_{o}-T_{s})\cdot e^{-k\cdot t}$ (1)

Where:

$T_{s}$ - Final temperature, in degrees Celsius.
$T_{o}$ - Initial temperature, in degrees Celsius.
$t$ - Time, in minutes.
$k$ - Cooling rate, in $\frac{1}{min}$ .
$T(t)$ - Current temperature, in degrees Celsius.

Please notice that substance reaches thermal equilibrium when $T(t) = T_{s}$ , that is when temperature of the substance is equal to the temperature of surrounding air.

If we know that $T_{o} = 80\,^{\circ}C$ , $t = 15\,min$ , $T_{s} = 50\,^{\circ}C$ and $T(15) = 60\,^{\circ}C$ , then the cooling rate of the substance is:

$60 = 50 + (80 - 50)\cdot e^{-15\cdot k}$

$\frac{60-50}{80-50}= e^{-15\cdot k}$

$\frac{1}{3} = e^{-15\cdot k}$

$k = -\frac{1}{15}\cdot \ln \frac{1}{3}$

$k \approx 0.0732$

The cooling rate of the substance is approximately 0.0732.

To learn more on Newton's law of cooling, we kindly invite to check this verified question: brainly.com/question/13748261

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2 years ago

Jackson has scores of 80, 90, 83, and 81 on four Math quizzes. What is the score he needs on the next quiz to achieve an average

kogti [31]

I think his score on his math test is going to need to be in the range of 79-84 which will get him there.
Hope this helps sorry if I’m wrong and be safe out there!!

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3 years ago

Forests when left to thrive form a _______, that remove carbon dioxide from there air.

hichkok12 [17]

Answer:

Hello! Your answer would be, photosynthesis.

Explanation:

Hope I helped! Ask me anything if you have questions! Brainiest plz. Hope You make a 100%! Have a nice day! -Amelia♥

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3 years ago

On his visit to the Galapagos Islands, Charles Darwin discovered several species of finches that varied from island to island, w

avanturin [10]

Answer: The answer is A) The species eat different foods.

The size of their beaks determine what type of foods they eat.

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3 years ago

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