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vovikov84 [41]
3 years ago
9

The area of each circle

Mathematics
1 answer:
Katyanochek1 [597]3 years ago
4 0

Answer:

8. 25\pi in^2

11. 9\pi m^2

Step-by-step explanation:

Area = \pi r^2

r = d/2

\pi = 3.14

8.

r = 10/2

r = 5 in

Area = \pi 5^2

Area = 25\pi in^2

10.

r = 6/2

r = 3 m

Area =\pi 3^2

Area = 9\pi m^2

Hope it helps! (:

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Answer:

If you dump all of them into one box then you know that one is the mixed

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3 years ago
Use the relationship between the angles in the figure to answer the question.
Brut [27]

Answer:

​x + 49 + 28 = 180​

Step-by-step explanation:

​The angles on a straight line with x° are 28° and 49° respectively, side by side with x°. This is because, vertical angles are equal. Therefore, the angle vertically opposite 28° and 49° are equal to 28° and 49° respectively.

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6 0
3 years ago
Read 2 more answers
If<br> DX/DT= 2cm/s <br> x=-1 <br> y=x^2+1<br> DY/DT=??
kobusy [5.1K]

Answer:

\frac{dy}{dt} = - 4 cm/s

Step-by-step explanation:

Let us revise the chain rule

If \frac{dy}{dt} = a and \frac{dx}{dt} = b, then

\frac{dy}{dx} = \frac{dy}{dt} ÷  \frac{dx}{dt} = \frac{a}{b}

∵ y = x² + 1

- Use the differentiation to find \frac{dy}{dx}

∴ \frac{dy}{dx} = 2x

∵ x = -1

- Substitute x by -1 in  \frac{dy}{dx}

∴  \frac{dy}{dx} = 2(-1)

∴  \frac{dy}{dx} = -2

∵  \frac{dy}{dt} =  \frac{dy}{dx} ×  \frac{dx}{dt}

∵ \frac{dx}{dt} = 2 cm/s

∴  \frac{dy}{dt} = (-2) × (2)

∴ \frac{dy}{dt} = - 4 cm/s

8 0
3 years ago
What is the product of 4n^+3=7n?
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So if you solve for n
4n^2+3=7n
make into trinomial
subtract 7n from both sides
4n^2-7n+3=0
if we can factor this, then we can asume that the factors are equal to zero becase if
xy=0 then assume x and/or y=0 so

to factor an equation in ax^2+bx+c where a is greater than 1 then
b=t+z
a times c=t times z
to factor 4n^2-7n+3 you do
4 times 3=12
what 2 numbers multiply to get 12 and add to get -7
the numbers are -3 and -4 so
split up the -7
4n^2-4n-3n+3
group
(4n^2-4n)+(-3n+3)
undistribute
(4n)(n-1)+(-3)(n-1)
reverse distributive property
ab+ac=a(b+c)
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set each to zero
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4n=3
divide both sides by 4
n=3/4

n-1=0
add 1 to both sides
n=1

n=3/4 or 1
4 0
3 years ago
Identify the variable expression that is not a polynomial:. a: x+12. b: 33. c: x^9+y^3. d: y^9+27
mina [271]
The term polynomial comes from the words poly- which means "many" and -nomial meaning "terms". In mathematics, a polynomial is an expression that consists of variables and coefficients wherein it only utilizes addition, subtraction, multiplication and a non-negative integer. In the given options above, the variable expression that is not a polynomial is option C. x^9+y^3.
7 0
3 years ago
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