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Liula [17]
3 years ago
9

PLEASSSSSE HELPPPPPP This is my third post of this! I really need help

Mathematics
1 answer:
Nesterboy [21]3 years ago
6 0
Answer: x=25

solution:

we know that
The triangle external angle theorem states that: An exterior angle of a triangle is equal to the sum of the opposite interior angles

In this problem:
m∠9=m∠7+m∠8

substitute the given values:
(6x-20)°=30°+4x°

now solve for x:
6x-4x=30+20
2x=50
x=25 which is the final answer:)
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A circle has an area of 36pi square inches. Find the radius
zmey [24]
<span>circle area = </span>πr²   ⇒

\pi r^2=36 \pi  \\ r^2= \frac{36 \pi }{ \pi }  \\ r^2=36 \\ r= \sqrt{36}  \\ r=6 \ in
6 0
3 years ago
The angles of traingle are in the ratio 3:7:8 find them in degrees as well as in radians​
I am Lyosha [343]
30°, 70°, and 80°.
It is an acute-angled triangle.
Explanation:
The ratio of the measures of ∠s in Δ is 3:7:8.
So, let us suppose that the measures are, 3k, 7k, 8k.
Evidently, their sum is
180°.

3k+7k+8k=180
18k=180
k= 10

Hence, the measures are,
30°, 70°, and 80°.
As all the angles are acute, so is the triangle.
6 0
3 years ago
PLEASE HELP!! THANK YOU &lt;3
Natalija [7]

Answer:

what did you need to know :(

3 0
3 years ago
Simplify the expression. <br> -3(b – 7)
pychu [463]
-3(b - 7)

Distributive property

-3*b = -3b

-3*7 = -21

-3b + 21

Answer:  -3b + 21

6 0
3 years ago
Factor 64v^3 + 192v^2 -56v - 168​
Kaylis [27]

Hello from MrBillDoesMath!

Answer:

8(v+3) ( -1/2 (sqrt(14) - 4 v) (4 v + sqrt(14)) )


Discussion:

Given

64v^3 + 192v^2 - 56 v - 168      

Factor 64v^2 from the first two terms. Factor 56 from the last two terms:

64v^2(v+3) - 56(v  + 3)     => factor (v+3) from both terms

(v+3) (64v^2 - 56)             => factor 8 from both terms in the right ()

8(v+3)(8v^2-7)                   => factor 8y^2-7

8(v+3) ( -1/2 (sqrt(14) - 4 v) (4 v + sqrt(14)) )



Thank you,

MrB

4 0
3 years ago
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