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Rashid [163]
3 years ago
8

As a 7 1/4 inch candle burns down, its height we decreases three-quarter inch inch each hour. How many hours does it take for th

e candle to burn completely?
Mathematics
1 answer:
Pani-rosa [81]3 years ago
8 0

Answer:

9.5 hours

Step-by-step explanation:

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ASAP please
algol13

Answer:

8

Step-by-step explanation:

8 0
2 years ago
Rui is a professional deep water free diver.
Arada [10]

Answer:

Rui will reach his lowest altitude after diving for 10 seconds

Step-by-step explanation:

In the quadratic equation y = ax² + bx + c, the coordinates of the lowest or the highest point is (h, k), where

  • h = \frac{-b}{2a} and k = y at x = h

In the given question

∵ d(x) = \frac{1}{2} x² - 10 x

∵ d represents his altitude in meters after x seconds

→ Compare it with the form above to find a and b

∴ a =  \frac{1}{2} and b = -10

∵ h = \frac{-b}{2a}

→ Substitute the values of a and b in the rule to find h

∴ h = \frac{--10}{2.\frac{1}{2}} = 10

∴ h = 10

∵ h is the x-coordinate of the lowest point

∴ The time of the lowest altitude is 10 seconds

∴ Rui will reach his lowest altitude after diving for 10 seconds

5 0
2 years ago
Read 2 more answers
I need help with this question
Murrr4er [49]

The number of cows is given by

14\cdot 2^{\frac{y}{5}}

So, after k years, the number of cows will be

14\cdot 2^{\frac{y+k}{5}}

We want this number to be twice as much as the original:

14\cdot 2^{\frac{y+k}{5}} = 2(14\cdot 2^{\frac{y}{5}})

First of all, we can cancel 14 from both sides:

2^{\frac{y+k}{5}} = 2\cdot 2^{\frac{y}{5}}

Finally, on the right hand side, we can use the exponent rule

a^b\cdot a^c=a^{b+c}

to get

2^{\frac{y+k}{5}} = 2^{\frac{y}{5}+1}

To solve this equation, we must impose that the two exponents are the same:

\dfrac{y+k}{5} = \dfrac{y}{5}+1 \iff \dfrac{y+k}{5} = \dfrac{y+5}{5}

And clearly this is true if and only if k=5. So, it will take 5 years for the cow heard to double in number.

You can do the exact same steps to find the doubling time for the sheeps.

8 0
3 years ago
Which equation shows y = -1/2x + 4 is in standard form?
Scrat [10]

For this case we have that by definition, the standard way to write the equation of a line, is given by:

ax + by = c

Where a, b and c are integers.

Given y =-\frac{1}{2}x+ 4

We can write it in the standard way:

\frac{1}{2}x+ y = 4

a=\frac{1}{2} and by the previous definition, the numbers a, b and c must be integers.

Thus, we multiply the equation by 2, on both sides so as not to alter the equality.

2*\frac{1}{2}x+ 2 * y= 2 * 4

x + 2y = 8

Thus, the equation of y =-\frac{1}{2}x+ 4 , in its standard form is given by:

x + 2y = 8

Answer:

Option B


4 0
3 years ago
Read 2 more answers
Can you please sub to me 999 Trendy is my yt if you help out ill give you a quick easy brainliest .
mel-nik [20]

Answer:

Ok! I will subscribe to you rn! :)

Step-by-step explanation:

Have a nice day! :)

7 0
2 years ago
Read 2 more answers
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