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Likurg_2 [28]
3 years ago
10

The equation y = (-16t-2)(t-1) represents the height in feet of a beach ball thrown by a child as a function of time, t ,in seco

nds.
1. Find the zeros of the function. Explain or show your reasoning.

2. What do the zeros tell us in this situation? Are both zeros meaningful?
Mathematics
1 answer:
Citrus2011 [14]3 years ago
4 0

Answer:

y = (-16t-2)(t-1)

To find the zeros, let's set y = 0 and separate these two expressions in parenthesis with the zero product property.

0 = -16t-2

0 = t-1

Now let's solve for t and get two zeros.

0 = -16t-2

2 = -16t

<u>t = -1/8</u>

0 = t-1

<u>t = 1</u>

1. Our two zeros are t = -1/8 and t = 1.

2. The two zeros are not both meaningful! Remember that this is modeling time, and we don't really care about -1/8 seconds. We don't need that negative time measurement, so we just want to know what's happening at 1 second. And at one second, the ball is on the ground. Great, so we know that height of ball = 0 after 1 second.

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Find the value of x such that 365 based seven + 43 based x = 217 based 10.
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We need to find the base x in the following equation:

365_7+43_x=217_{10}

First, lets convert 365 from base 7 to base 10. This is given by

365_7=3\times7^2+6\times7^1+5\times7^0

where the upperindex denotes the position of eah number. This gives

\begin{gathered} 365_7=3\times49+6\times7+5\times1 \\ 365_7=147+42+5 \\ 365_7=194_{10} \end{gathered}

that is, 365 based 7 is equal to 194 bases 10.

Now, lets do the same for 43 based x. Lets convert 43 based x to base 10:

43_x=4\times x^1+3\times x^0

where again, the superindex 0 and 1 denote the position 0 and 1 in the number 43. This gives

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Now, we have all number in base 10. Then, our first equation can be written in base 10 as

194_{10}+(4x+3)_{10}=217_{10}

For simplicity, we can omit the 10 and get

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and by moving 197 to the right hand side, we obtain

\begin{gathered} 4x=217-197 \\ 4x=20 \end{gathered}

Finally, we get

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Therefore, the solution is x=5

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Help? pre cal, will give points
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Steps to solve:

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Thus, the correct answer is 0, 3.

___________

Best of Luck!

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