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2 years ago

Hi pls help me!!! thank you

Mathematics

1 answer:

elena-s [515]2 years ago

6 0

Step-by-step explanation:

Circumference (C):

$C = 2\pi r = 2\pi(5\:\text{ft}) = 31.4\:\text{ft}$

Area (A):

$A = \pi r^2 = \pi(5\:\text{ft})^2 = 78.5\:\text{ft}^2$

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A reporter for a student newspaper is writing an article on the cost of off-campus housing. A sample was selected of 10 one-bedr

olga55 [171]

Answer:

(507.05, 592.95)

Step-by-step explanation:

Given data:

sample mean = $550, sample standard deviation S = $60.05

95% confidence interval , n = 10

For 95% confidence interval for the mean

mean ± M.E.

where M.E. is margin of error = $t_{n-1}, \alpha/2\times\frac{S}{\sqrt{n} }$

Substituting the values in above equation

$=t_{10-1}, 0.05/2\times\frac{60.05}{\sqrt{10} }$

= 2.62×18.99

=42.955

= 550±42.95

=(507.05, 592.95)

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3 years ago

The circumference of a circle is 20π m. What is the area, in square meters? Express your answer in terms of \piπ.

never [62]

Answer:

A≈31.83

Step-by-step explanation:

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3 years ago

Rewrite the quadratic function in vertex form.<br> Y=3x^2-12x+4

chubhunter [2.5K]

Answer:

$\large\boxed{y=3(x-2)^2-8}$

Step-by-step explanation:

The vertex form of an equation of a parabola y = ax² + bx + c:

$f(x)=a(x-h)^2+k$

(h, k) - vertex

$h=\dfrac{-b}{2a},\ k=f(h)$

We have the equation:

$y=3x^2-12x+4\\\\a=3,\ b=-12,\ c=4$

Substitute:

$h=\dfrac{-(-12)}{2(3)}=\dfrac{12}{6}=2\\\\k=f(2)=3(2^2)-12(2)+4=3(4)-24+4=12-24+4=-8$

Finally:

$y=3(x-2)^2+(-8)=3(x-2)^2-8$

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3 years ago

Keisha bought 11 pounds of rice for $5.

Mazyrski [523]

Answer:

$2.20

Step-by-step explanation:

11 pounds of rice for $5.

Divide the $5 by 11.

11 divided by 11 is 1.

So 1 pound of rice is $2.20.

(PS i might be wrong, SO SORRY IF I AM)

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3 years ago

The time it takes for a race car to finish a lap (to the nearest tenth of a second) is represented by the variable t. Which set

jeka94

Velocity=Distance/Time
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3 years ago