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3 years ago

Does anyone know how to sovle this

Mathematics

1 answer:

Umnica [9.8K]3 years ago

7 0

The 2 interior angles add to the exterior angle
26+13=x
39=x

x=39°

because

remember, all angles add to 180
26+13+BCA=180
39+BCA=180
minus 39 both sides
BCA=141
look, we want x

BC is a striaign line which is 180
BCA+x=180
141+x=180
minus 141 from both sides
x=39°

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Luba_88 [7]

First, we would set the number to x.

Then, we turn the words into an equation.

x+75 = 3x-39

Isolate the x.

-2x = -114

So...

x = 57

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3 years ago

NASA scientists discovered a planet in December of 2004. After observation, they have come to a conclusion that the population d

AURORKA [14]

Step-by-step explanation:

so, there is a population in that planet. right ?

that means they discovered a populated planet.

anyway,

18 years

p0 is the start population.

p0 × 2 after 3 years

p0 × 2 × 2 = p0 × 4 after 6 years

p0 × 4 / 6 after 6 years

(p0 × 4 / 6) × 2 after 9 years

(p0 × 4 / 6) × 4 after 12 years = p0 × 8/3 after 12 years

(p0 × 8/3) / 6 after 12 years = p0 × 8/18 = p0 × 4/9

p0 × 4/9 × 2 after 15 years

p0 × 4/9 × 4 after 18 years

p0 × 4/9 × 4 / 6 after 18 years = p0×16/54 = p0 × 8/27 = 512

p0 = 512×27/8 = 1728

p(n) = p0 × (2/3)^(n/6)

with n being years.

because

the population changes by a factor 2 every 3 years = 2^(n/3)

and by a factor 1/6 every 6 years = (1/6)^(n/6).

so,

p(n) = p0 × 2^(n/3) × (1/6)^(n/6)

2^(n/3) = 2^(2n/6) = 2²^(n/6) = 4^(n/6)

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7 0

3 years ago

if 1 gallon of paint covers 400 square feet, about how many gallons of paint are needed to paint the outside of a spherical tank

ollegr [7]

Given:
Diameter if the spherical tank = 20 ft.
Now,
We know,
radius = diameter / 2
= 20 / 2
= 10 ft.
Now,
The area of the spherical tank = $4 \pi r^{2}$

= $4 \pi (10)^{2}$

= $4 * \pi *100$

= $1256.637061$

= $1256.64~ft^2-->rounded$

Now,
According to the question,
400 ft² needs 1 gallon of paint
1 ft² needs (1 / 400) gallon of paint
1256.64 ft² needs (1 / 400) * 1256.64 gallon of paint
= 3.1416 gallon of paint
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4 years ago

If m = 4, what is 6×(8−m)? A 10 B 20 C 24 D 72

mr_godi [17]

Answer:

Hi, There! ≧ω≦

<h2>Question</h2>

f m = 4, what is 6×(8−m)?

<h2>Answer</h2>

Step-by-step explanation:

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aivan3 [116]

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