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riadik2000 [5.3K]
3 years ago
14

Keisha throws a rock down an old well the distance D in Feet The Rock Falls after T seconds can be represented by D =16t ^ 2 + 6

4t if the water in the well is 80 ft below ground how many seconds will it take for the rock to hit the water?​
Mathematics
1 answer:
sesenic [268]3 years ago
7 0

Answer:

<em>1</em><em> </em><em>second</em><em> </em>

Step-by-step explanation:

<em>16t</em><em>^</em><em>2</em><em>+</em><em>64t</em><em>=</em><em>80</em>

<em>16t</em><em>^</em><em>2</em><em>+</em><em>64t-80</em><em>=</em><em>0</em>

<em>64</em><em>^</em><em>2-4</em><em>(</em><em>16</em><em>)</em><em>(</em><em>-80</em><em>)</em>

<em>9216</em>

<em>-64-96</em>

<em>______</em><em> </em><em>=</em><em> </em><em>-5</em>

<em> </em><em> </em><em> </em><em>32</em>

<em>-64</em><em>+</em><em>96</em>

<em>_______</em><em> </em><em>=</em><em> </em><em>1</em><em> </em><em>sec</em>

<em> </em><em> </em><em> </em><em> </em><em>32</em>

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2 years ago
George had $6,000 in a savings account earning simple interest at a rate of 5% per year. At the end of the year, George paid 25%
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Answer:

<em>$225</em>

<em></em>

Step-by-step explanation:

Given that:

Principal = $6,000

Interest rate = 5%

Time = 1 year

Taxes paid = 25% on the interest earned

To find:

Money earned after paying taxes ?

Solution:

First of all, let us calculate the total interest earned:

Formula for Simple Interest is given as:

SI =\dfrac{PRT}{100}

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T is the time taken

Putting the given values:

SI =\dfrac{6000 \times 5\times 1}{100} =\$300

Now, it is given that 25% of the interest earned is given as taxes.

Taxes paid = 25% of $300

\Rightarrow \dfrac{25}{100} \times 300 =\$75

Therefore, the money earned = Interest earned - Taxes paid

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8 0
3 years ago
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