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3 years ago

Help me please, help

Mathematics

1 answer:

emmainna [20.7K]3 years ago

3 0

Answer:

x>0

Step-by-step explanation:

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It takes the hot water faucet twice as long to fill a bathtub as it does the cold water faucet. Left on together, the cold and h

Lerok [7]

Answer:

Step-by-step explanation:

Make a system of equations

Give the hot and cold faucets variables

Set x to be the minutes it takes for the hot water faucet to fill up the tub and Set y to be the minutes it takes for the cold water faucet to fill up the tub

She first equation is x = 2y because the hot faucet takes 2 times as much time as the cold water

The second equation is x + y = 5 because if you add the number of minutes each takes to fill a tub, it will add up to 5 minutes

Now you have the equations

x = 2y

x + y = 5

So you can plug the first equation in for x in the second one to make

2y + y = 5

which equals 3y = 5

Then you divide 3 from both sides to get

y = $\frac{5}{3}$

Since y is the number of minutes the cold water faucet takes to fill the tub, then the cold faucet takes $\frac{5}{3}$ minutes for the cold water faucet to fill the tub itself

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3 years ago

If f(x) = 2x^2 + 1 and g(x) = x^2 - 7, find (f - g)(x).

zavuch27 [327]

2x squared +1 (-)x squared -7 is
a.) x squared +8

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3 years ago

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Byron has 72 coins in his piggy bank. The piggy bank contains only dimes

Mashutka [201]

3. 25 cents per quarter, and then the reamaining amount ids dimes, which are 10 cents apeice.

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3 years ago

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Solve for x: 2700=300•2^10x Check all that apply.Options are in image above

Genrish500 [490]

Answer:

B and C

Step-by-step explanation:

$300 \times {2}^{10x} = 2700 \\ {2}^{10x} = \frac{2700}{300} = \frac{27}{3} = 9 \\ {2}^{10x} = 9 \\ log( {2}^{10x} ) = log(9) \\ 10x \times log(2) = log(9) \\ (10 log(2) )x = log(9) \\ x = \frac{ log(9) }{10 \times log(2) }$

However, if you replace log with ln you can easily reach to the following solution as well.

$x = \frac{ ln(9) }{10 \times ln(2) }$

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3 years ago

If point (4, 5) is on the graph of a function, which equation must be true?

lozanna [386]

You didn’t list any equation so I would say it would be
4 ≤ h(x) ≤5

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3 years ago