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dolphi86 [110]
3 years ago
13

Wat is 7x² + 4x - 5= 0

Mathematics
2 answers:
lara [203]3 years ago
5 0
7x^2+4x-5=0\\
\Delta=4^2-4\cdot7\cdot(-5)=16+140=156\\
\sqrt{\Delta}=\sqrt{156}=2\sqrt{39}\\
x=\dfrac{-4\pm2\sqrt{39}}{2\cdot7}=\dfrac{-2\pm\sqrt{39}}{7}
frosja888 [35]3 years ago
4 0
Answer and workings in the attachment below.

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Assume that P(E) = 0.471 and P(F) = 0.595. If E and F are independent, find P(E and F)
dsp73

The value of the probability P(E and F) is 0.2802

<h3>Independent probability</h3>

Events are known to be independent if the occurrence of one does not affect the other.

Given the following parameters

P (E) =0.471

P(F) = 0.595

If E and F are independent, then;

P(E and F) = P(E)P(F)

P(E and F)  = 0.471 * 0.595
P(E and F)  = 0.2802

Hence the value of the probability P(E and F) is 0.2802

Learn more on independent events here: brainly.com/question/1374659

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2 years ago
What is the lateral area of the cone to the nearest whole number? The figure is not drawn to scale. Helppp which one is it
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6 0
3 years ago
Just answer number 7 and 8
melamori03 [73]
We are given the equation:
F = 2.25+0.2(m-1)
where:
F is the fare
m is the number of miles.

In question 7, we are given that the fare (F) is equal to $6.05 and we need to get the number of miles. To do so, we will simply substitute with the fare in the given equation and solve for the number of miles (m) as follows:
F = 2.25 + 0.2(m-1)
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6.05-2.25 = 0.2(m-1)
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19 = m-1
m = 19+1
m = 20 miles

Number 8 is exactly the same, but we will substitute F=7.65 and again solve for m
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3 years ago
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Answer:

65% are green

Step-by-step explanation:

13 is 65% of 20

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The area of a trapezoid is 30 cm. If
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The height of the trapezoid is 2 cm

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