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3 years ago

Plz Help ASAP!! Thank You :>

Mathematics

1 answer:

soldier1979 [14.2K]3 years ago

5 0

Answer and Step-by-step explanation:

The volume of a cylinder is $\pi r^{2} h$ , in which:

r = radius

h = height

d = 2 × r

$\pi$ will equal 3.14.

Plug it in to the equation.

$V = (3.14)(12^{2} )(42)\\\\\\\\V = (3.14)(144)(42)\\\\\\\\V = (452.16)(42)\\\\\\\\V = 18990.72cm^3$

18990.72 $cm^3\\$ is the answer. (2nd Answer choice)

x = -2

Expression is:

$5 - x^2$

Plug -2 in for x.

$5 - (-2)^2\\\\\\\\5 - 4\\\\\\\\1$

1 is the answer choice. (1st Answer choice).

#teamtrees #PAW (Plant And Water)

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4 years ago

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I need help now plz

Romashka-Z-Leto [24]

Answer:

Step-by-step explanation:

The picture is a bit blurry, but from what i can see, i'd say C (whichever one has -4 x 3 x 1 under the square root.)

So for this, you need to know the quadratic formula, which is:

$\frac{-b ± \sqrt{b^{2} -4ac} }{2a}$

*ignore the weird capital A, it keeps coming up when i try to use the ± symbol

They have given you the equation of a quadratic, so the first thing you have to do is rearrange it, so that $x^{2}$ comes first.

So now we have the equation: 3 $x^{2}$  - 2x +1

*the quadratic formula uses a, b and c, but they are specific. a is always the coefficient of $x^{2}$ , b is always the coefficient of x and c is always the constant (number without an x)

So, i can find that, in this case:

a = 3 b= -2 c=1

Now substitute each of those values it into the original quadratic equation:

$\frac{-(-2) ± \sqrt{(-2)^{2} -4(3)(1)} }{2(3)}$

*again, ignore the weird capital A.

That's how you find the answer, which from what i can tell in the picture is C.

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3 years ago

How do I write an equation in slope intercept form for a line that is parallel to the y-axis and has has an x-intercept of 3

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3 years ago

Let μ denote the true average reaction time to a certain stimulus. For a z test of H0: μ = 5 versus Ha: μ > 5, determine the

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Answer:

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