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seraphim [82]
3 years ago
6

How do I find the area of a circle with the diameter of 4

Mathematics
1 answer:
goblinko [34]3 years ago
7 0

Answer:

use a = 1/4\pi d^2\\

all you have to do is plug 4 into d and then square it, and multiply everything together.

Step-by-step explanation:

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liraira [26]
Some ways you can make the number 2 are
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3 years ago
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Let sin t = a​, cos t = b​, and tan t = c. Write the expression in terms of​ a, b, and c.
maks197457 [2]

Answer:

a+b-c

*Note c could be written as a/b

Step-by-step explanation:

-sin(-t - 8 π) + cos(-t - 2 π) + tan(-t - 5 π)

The identities I'm about to apply:

\sin(a-b)=\sin(a)\cos(b)-\sin(b)\cos(a)

\cos(a-b)=\cos(a)\cos(b)+\sin(a)\sin(b)

\tan(a-b)=\frac{\tan(a)-\tan(b)}{1+\tan(a)\tan(b)}

Let's apply the difference identities to all three terms:

-[\sin(-t)\cos(8\pi)+\cos(-t)\sin(8\pi)]+[\cos(-t)\cos(2\pi)+\sin(-t)\sin(2\pi)]+\frac{\tan(-t)-\tan(5\pi)}{1+\tan(-t)\tan(5\pi)}

We are about to use that cos(even*pi) is 1 and sin(even*pi) is 0 so tan(odd*pi)=0:

-[\sin(-t)(1)+\cos(-t)(0)]+[\cos(-t)(1)+\sin(-t)(0)]+\frac{\tan(-t)-0}{1+\tan(-t)(0)

Cleaning up the algebra:

-[\sin(-t)]+[\cos(-t)]+\frac{\tan(-t)}{1}

Cleaning up more algebra:

-\sin(-t)+\cos(-t)+\tan(-t)

Applying that sine and tangent is odd while cosine is even.  That is,

sin(-x)=-sin(x) and tan(-x)=-tan(x) while cos(-x)=cos(x):

\sin(t)+\cos(t)-\tan(t)

Making the substitution the problem wanted us to:

a+b-c

Just for fun you could have wrote c as a/b too since tangent=sine/cosine.

8 0
3 years ago
Write an equivalent<br> expression for<br> 7(3 – X) + 15x
Ne4ueva [31]

Answer:

21+8x

Step-by-step explanation:

7(3 – X) + 15x

21-7x+15x

21(-7x+15x)

21+8x

5 0
3 years ago
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Help me all please!!
Harlamova29_29 [7]
No matter how many pizzas he orders (P) he will be charged 4.50. then each pizza is worth 9.50 so you multiply that by how many he orders (5)
c=4.5+9.5p 
c=4.5+9.5(5)
c=$52

for these problems you do the opposite of what is shown
1. h+7=15, subtract 7 from each side. h=8
2. m-10=24, add 10 to each side m=34
3.6t=96, divide both sides by 6 t=16
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7 0
3 years ago
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HELP. I NEEEED HELP. THANK YOU.
rodikova [14]

Answer:

The slope is 1/2

Step-by-step explanation:

If you watch where each dot landes, it's half of each y number. The sodas cost $0.50 which is half of 1.

6 0
2 years ago
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