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3 years ago

N six years, john will be four times as old as mary is right now. right now, john is twice as old as mary. how old is john

Mathematics

1 answer:

Temka [501]3 years ago

4 0

John is 6 years old and mary is 3.

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Which choice describes a question that could be answered by moving the decimal point 2 places to the left?

11Alexandr11 [23.1K]

2=0.02 the decimal always starts behind the number so all u do to move the decimal u put 0's in front of the number. Here is another example. 4=0.04 Let say the problem is 56=0.56 Let me know if that u understand it.

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3 years ago

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A sink has two faucets: one for hot water and one for cold water. The sink can be filled by a cold water faucet in 3 minutes. If

iragen [17]

Answer: $6\ minutes$

Step-by-step explanation:

You can use the following formula:

$\frac{T}{A}+\frac{T}{B}=1$

You can say that "T" is the time (in minutes) for both faucets working together, "A" is the time (in minutes) for cold water faucet working alone and "B" is the time (in minutes) for hot water faucet working alone.

Based on the data given in the exercise, you can identify that:

$T=2\\A=3$

Therefore, substituting these values into the formula and solving for "B", you get that this is:

$\frac{2}{3}+\frac{2}{B}=1\\\\\frac{2}{B}=1-\frac{2}{3}\\\\\frac{2}{B}=\frac{1}{3}\\\\2=\frac{1}{3}B\\\\2*3=B\\\\B=6$

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3 years ago

What is the derivative of the function below?

11111nata11111 [884]

$g(x)=4x-\dfrac{1}{4x}=4x-(4x)^{-1}\\\\\\\\g'(x)=\left[4x-(4x)^{-1}\right]'=(4x)'-\left[(4x)^{-1}\right]'=4-[-1(4x)^{-2}]\cdot4\\\\=4+\dfrac{1}{(4x)^2}\cdot4=4+\dfrac{4}{4^2x^2}=\boxed{4+\dfrac{1}{4x^2}}\\\\Used:\\\\(f(x)-g(x))'=f'(x)-g'(x)\\\\.[f(g(x))]'=f'(g(x))\cdot g'(x)\\\\(x^n)'=nx^{n-1}$

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3 years ago

On a number line, 7.7 would be located. Choose all answers that make a

PolarNik [594]

Answer:

The Correct Answer are B and D

Step-by-step explanation:

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Parts of a Parabola????

eduard

Answer:

the directrix and focus the axis of symmetry (goes through the focus, at right angles to the directrix) the vertex (where the parabola makes its sharpest turn) is halfway between the focus and directrix.

Step-by-step explanation:

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3 years ago