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2 years ago

Please help!!!

Mathematics

1 answer:

sveticcg [70]2 years ago

8 0

Answer:

I don't know how to do this thing

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Indicate true or false as to weather the following equation is quadratic x(x^2+1)=0 true or false

beks73 [17]

$\bf x(x^2+1)=0\implies \stackrel{distributing}{x^3+x=0}\impliedby \textit{notice the }^3\textit{, is not quadratic, is \underline{cubic}}$

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2 years ago

Can someone kindly explain and answer this for me please!

Lubov Fominskaja [6]

Answer:

Step-by-step explanation:

7 * 7 = 49

24 * 24 = 576

576 + 49 = 625

$\sqrt{625} = 25$

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2 years ago

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Right triangles abc and dbc with right angle c are given below. If cos(a)=15,ab=12 and cd=2, find the length of bd.

dmitriy555 [2]

see the attached figure to better understand the problem

we have that

$cos(A)=\frac{1}{5} \\ AB=12\ units\\ CD=2\ units$

Step 1

Find the value of AC

we know that

in the right triangle ABC

$cos (A)=(AC/AB)\\AC=AB*cos(A)$

substitute the values in the formula

$AC=12*(1/5)\\ AC=2.4\ units$

Step 2

Find the value of BC

we know that

in the right triangle ABC

Applying the Pythagorean Theorem

$AB^{2} =AC^{2}+BC^{2}\\ BC^{2}=AB^{2} -AC^{2}$

substitute the values

$BC^{2}=12^{2} -2.4^{2}\\BC^{2}= 138.24\\ BC=11.76\ units$

Step 3

Find the value of BD

we know that

in the right triangle BCD

Applying the Pythagorean Theorem

$BD^{2} =DC^{2}+BC^{2}$

substitute the values

$BD^{2} =2^{2}+11.76^{2}$

$BD=11.93\ units$

therefore

the answer is

the length of BD is 11.93 units

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2 years ago

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8 + 5n = -72 Solve the equation.

HACTEHA [7]

8 + 5n = -72
5n = -72 - 8
5n = - 80
n = -80/5
n = -16

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