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3 years ago

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