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Viktor [21]
3 years ago
14

Without graphing estimate the x-intercepts of the graph of f(x)=7x^2+9x+1 to the nearest tenth.

Mathematics
1 answer:
frosja888 [35]3 years ago
5 0
The x-intercepts are at -0.1 and -1.2.

We will use the quadratic formula to find these:
x=\frac{-b\pm \sqrt{b^2-4ac}}{2a}
\\
\\=\frac{-9\pm \sqrt{9^2-4(7)(1)}}{2(7)}=\frac{-9\pm \sqrt{81-28}}{14}
\\
\\=\frac{-9\pm \sqrt{53}}{14}=\frac{-9+\sqrt{53}}{14}\text{ or } \frac{-9-\sqrt{53}}{14}
\\
\\=-0.1\text{ or }-1.2
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Answer:6

Step-by-step explanation:

$220 × 6 = $1320 this is how much it cost to pay 6 carpenters for one day. Now lets find how much it cost to 12 plumbers at $260 a day. $260 × 12 = $3120 this is how much it costs to pay 12 plumbers a day.

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What is the significance of the mean of a probability​ distribution?
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Answer:

Significance of the mean of a probability​ distribution.          

Step-by-step explanation:

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4 0
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How do you solve log_9 x + log_9 (x + 12) = log_9 64?
igor_vitrenko [27]
<span>log_9 x + log_9 (x + 12) = log_9 64?
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For this case we have that in one hour there are 60 minutes. On the other hand, we have that 1 mile equals 5280 feet.

So, we have:

\frac {ft} {min} = \frac {ft} {min} * 60 \frac {min} {h} * \frac {1} {5280} \frac {mile} {ft}\\\frac {ft} {min} = \frac {60} {5280} \frac {miles} {h}

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\frac {ft} {min} = \frac {60} {5280} \frac {miles} {h}

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