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3 years ago

What is the lateral surface area of a cone with radius 19 cm and slant height 11 cm?

Mathematics

1 answer:

gizmo_the_mogwai [7]3 years ago

8 0

Answer:

About 1310.469 cm³

Step-by-step explanation:

The formula is $\pi r\sqrt{h^2+r^2}=\pi\cdot19\cdot\sqrt{11^2+19^2}\approx1310.46973$

Hope this helps, and PM me with any more questions!

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Solve x2 - 8x - 9 = 0. Rewrite the equation so that it is of the form x2 + bx = c.

barxatty [35]

Answer:

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Explanation:

we have been given with the quadratic equation $x^2-8x-9$

we compare the given quadratic equation with general quadratic equation

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from given quadratic equation a=1,b= -8,c= -9

substituting these values in the formula for discriminant $D=b^{2}-4ac$

$D=(-8)^2-4(1)(-9)=100$

Now, to find the value of x

Formula is $x=\frac{-b\pm\sqrt{D}}{2a}$

Now, substituting the values we will get

$x=\frac{-(-8)\pm\sqrt{100}} {2}= \frac{8\pm10}{2}=9,-1$

And rewritting the given equation by shifting 9 to right hand side of the given equation and taking minus inside the bracket so as to convert it in the form of

$x^2+bx=c$

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Answer:

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Step-by-step explanation:

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