2 years ago

Help with these please!

Mathematics

2 answers:

m_a_m_a [10]2 years ago

6 0

Answer:

Step-by-step explanation:

Anuta_ua [19.1K]2 years ago

3 0

Answer:

יגיממב בנננהגמדכככבק ןפדצסוכדהד

Step-by-step explanation:

צמגמנג

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Some one please help me on this I am very much dum

AURORKA [14]

I don’t know this one either bro

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2 years ago

Factor the quadratic equation below to reveal the solutions. X^2+4x-21=-9

a_sh-v [17]

Answer:

x = 3 and x = -7

Step-by-step explanation:

The given quadratic equation is $x^2+4x-21=0$ . We need to find the solution of this equation.

If the equation is in the form of $ax^2+bx+c=0$ , then its solutions are given by :

$x=\dfrac{-b\pm \sqrt{b^2-4ac} }{2a}$

Here, a = 1, b = 4 and c = -21

Plugging all the values in the value of x, such that :

$x=\dfrac{-b+ \sqrt{b^2-4ac} }{2a},\dfrac{-b- \sqrt{b^2-4ac} }{2a}\\\\x=\dfrac{-4+ \sqrt{(4)^2-4\times 1\times (-21)} }{2(1)},\dfrac{-4- \sqrt{(4)^2-4\times 1\times (-21)} }{2(1)}\\\\x=3, -7$

So, the solutions of the quadratic equation are 3 and -7.

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2 years ago

You are in a bike race. When you get to the first checkpoint you are 2/5 of the distance away to the second checkpoint. When you

gizmo_the_mogwai [7]

the answer is 1/4 of a distance away

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A sphere has a diameter of 14 units. What is the volume of the sphere in cubic units? If a cylinder has the same radius as the s

lesya692 [45]

Answer:

Step-by-step explanation:

r = 14/2 = 7units

$Volume of sphere=\frac{4}{3}*\pi*r^{3}\\\\=\frac{4}{3}*3.14*7*7*7\\\\=1436.03cubic units\\\\Volume of cylinder=\pi*r^{2}*h\\\\=3.14*7*7*14\\\\=2154.04 cubic units$

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const2013 [10]

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384/12 or 192/6 or 96/3

Step-by-step explanation:

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