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irina [24]
3 years ago
13

What is the value of x?

Mathematics
2 answers:
anastassius [24]3 years ago
5 0
The unknown angle is <em>80°. </em>There is a <em>simple</em> formula to figure out the unknown angle. Add the angles and then subtract the sum of the two angles from 180. You would do this because the sum of interior angles of a triangle is 180°. 

<em>x=180°-(angle 1 + angle 2)</em>

Anna11 [10]3 years ago
3 0
A triangle should equal 180,

30+70 = 100

100-180 = 80

So x=80

30+70+80= 180 

Hope this helped! and mark brainliest please if you could ((:

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nordsb [41]

Find the missing side or angle. Round to the nearest tenth. A=45° B=100° c=15 a=[?]​

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3 years ago
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Find the indefinite integral by using the substitution x = 4 sec(θ). (Use C for the constant of integration.) x2 − 16 x d
guapka [62]

Answer:

\frac{x^2-16}{2} + 16ln\frac{4}{x}  +16C

Step-by-step explanation:

Given the indefinite integral \int\limits{\frac{x^2-16}{x} } \, dx, using the substitute

x = 4 sec(θ)...1

The integral can be calculated as thus;

First let us diffrentiate the substitute function with respect to θ

dx/dθ = 4secθtanθ

dx =  4secθtanθdθ... 2

Substituting equation 1 and 2 into the integral function we will have;

\int\limits{\frac{(4sec \theta)^2-16}{4sec \theta} } \, 4sec \theta tan \theta d \theta\\\int\limits{\frac{16sec^2 \theta-16}{4sec \theta} } \, 4sec \theta tan \theta d \theta\\\int\limits{\frac{(16(sec^2 \theta-1)}{4sec \theta} } \, 4sec \theta tan \theta d \theta\\\\from \ trig \ identity,\  sec^2 \theta - 1 = tan^\theta\\\\\int\limits{\frac{16 tan^2 \theta}{4sec \theta} } \, 4sec \theta tan \theta d \theta\\\\\int\limits 16 tan^3 \theta d \theta\\\\

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3 0
3 years ago
7 (m+5) = 21 <br> as a step by step problem?
Sever21 [200]

Answer:

m=-2

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You want to isolate the variable on one side (m).

Divide each side by 7.

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8 0
2 years ago
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alexgriva [62]

Answer:

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B - Fog.

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8 0
3 years ago
8. What’s the answer to this question please
Fed [463]

D) $5

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25/5= 5

3 0
3 years ago
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