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Kisachek [45]
3 years ago
11

Pls help this is my last problem and I need to pass this class?!?

Mathematics
2 answers:
densk [106]3 years ago
8 0

Answer:

A = 50°

Step-by-step explanation:

(2x - 10) + (x + 30) + 70 = 180 \\ 2x + x = 180 + 10 - 30 - 70 \\ 3x = 90 \\ x =  \frac{90}{3}  \\ x = 30

Then

a = 2x - 10 \\ a = 2(30) - 10 \\ a = 60 - 10 \\ a = 50

Karolina [17]3 years ago
8 0

\mathfrak{\huge{\orange{\underline{\underline{AnSwEr:-}}}}}

Actually Welcome to the Concept of the Triangles.

Since we know that, the Angle sum property of a triangle is equal to 180°.

means that, <A + <B + <C = 180°

so we can write as,

==> 2x-10 + x + 30 +70 = 180°

===>3x +90 = 180

==> 3x = 90

hence, x = 30°

so now, substitute angle x,

So angle A is => 2(30)-10 => 60-10 = 50°

hence Angle A = 50°.

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The heights in inches of males in the united states are believed to be approximately normally distributed with mean u the mean h
vovikov84 [41]

Answer:

Standard error = 0.83

Step-by-step explanation:

Given that the heights in inches of males in the united states are believed to be approximately normally distributed with mean u

Sample mean for 25 adults randomly taken =

\bar x = 69.72 inches

Std deviation of sample s = 4.15 inches

Since X  the height of males is Normal we find that the sample mean also will follow a normal distribution.

By central limit theorem, mean of x would be= sample mean= 69.72

Std error = \frac{s}{\sqrt{n} } =\frac{4.15}{5} \\=0.83

Standard error of the mean = std dev/square root of sample size.

Here only sample std deviation is known

So we used it

Standard error = 0.83

6 0
3 years ago
Hi guys can someone pls help me with this ASAP
Gennadij [26K]

Answer:

the second one

Step-by-step explanation:

8 0
3 years ago
The length of a rectangle is 4yd longer than it’s with. If the perimeter of the rectangle is 68yd, find it’s length and width.
Tom [10]

Answer:

L = 19 yd

W = 15 yd

Step-by-step explanation:

2L + 2W = 68

L = W + 4

Substitute for L in the first equation

2(W + 4) + 2W = 68

2W + 8 + 2W = 68

4W = 60

W = 15 yd

Plug W in the second equation to find L

L = W + 4

L = 15 + 4

L = 19 yd

Plug both answers in both equations to check

First equation = 2 (19) + 2 (15) = 68

Second equation = 19 = 15 + 4

Hope that helps!

7 0
4 years ago
Rewrite the equation by completing the square.<br> 4x² + 20r + 25 = 0<br> (x+...)^2=...
sattari [20]

Answer:

The equation 4\cdot x^{2} + 20\cdot x + 25 = 0 is equal to \left(x + \frac{5}{2} \right)^{2} = 0.

Step-by-step explanation:

Let be the equation 4\cdot x^{2} + 20\cdot x + 25 = 0, we proceed to rewrite the equation solely by algebraic means:

1) 4\cdot x^{2} + 20\cdot x + 25 = 0 Given

2) (2\cdot x)^{2} + 10\cdot (2\cdot x) + 25 = 0 Definition of power/Associative property

3) (2\cdot x + 5)^{2} = 0   Perfect square trinomial

4) 2^{2}\cdot \left(x + \frac{5}{2} \right)^{2} = 0 Distributive property/(a\cdot b)^{c} = a^{c}\cdot b^{c}

5) 4\cdot (x + \frac{5}{2} )^{2} = 0 Definition of power

6) \left(x + \frac{5}{2} \right)^{2} = 0 Compatibility with multiplication/Commutative and modulative properties/a\cdot 0 = 0

4 0
3 years ago
What’s the answer ?
tiny-mole [99]
3m +  xy = \dfrac{xp}{4}

Cross multiply:
4( 3m +  xy) = xp

Distribute 4:
12m +  4xy = xp

Take away 4xy from both sides:
xp - 4xy = 12m

Take x as the common factor:
x(p - 4y) = 12m

Divide both sides by p - 4y :
x =  \dfrac{12m}{p - 4y}

7 0
4 years ago
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