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3 years ago

CAN SOMEONE PLZzzz Plzzzz HELP!!!???

Mathematics

1 answer:

umka21 [38]3 years ago

8 0

First plot the points. Let’s just use the first graph. When you have done that. Draw a triangle. Find the right angle and look at what line is across from that. That is the hypotenuse. That is the length that you are trying to find. So you have to do your equation: a^2 + b^2 = c^2. A and B have to be the length of the other 2 lines(just count it). When you have done that repack you a and b with your #s. And what ever is equal to you c. Then that is you answer. (Im sorry if this was confusing)

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Why is -a² is always negative (a ≠ 0) and why is (-a)² is always positive?

hjlf

$-a^2=(-1)\cdot a\cdot a$

Regardless of the sign of $a$ , we have $a\cdot a=a^2\ge0$ (never negative). But multiplying by -1 makes it negative.

On the other hand,

$(-a)^2=((-1)\cdot a)^2=(-1)^2\cdot a^2=1\cdot a^2=a^2$

which can never be negative for real $a$ .

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2 years ago

The combined height of one fir tree and one pine tree is 212121 meters. The height of 444 fir trees stacked on top of each other

inn [45]

Answer: The height of each fir tree is 9 meters, and the height of each pine tree is 12 meters.

Step-by-step explanation:

Let x= height of each fir tree, y = height of each pine tree.

As per given, we have

x+y = 21 (i)

4x=y+24 (ii)

From (ii),

$4x-y=24$ (iii)

Add (i) and (iii), we get

$5x=45\\\\\Rightarrow\ x=\dfrac{45}{5}\\\\\Rightarrow\ x=9$

Put value of x in (i), we get

$9+y=21\Rightarrow y=12$

Hence, the height of each fir tree is 9 meters, and the height of each pine tree is 12 meters.

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2 years ago

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Which of the following is an arithmetic sequence? 0,2,4,6 1,2,4,8 1,4,8,13

STatiana [176]

It is probably 0,2,4,6 because other ones go "out of the sequence".

Hope this helps. :)

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3 years ago

What is the vertex of the graph of the function below y=x^2-8x+12

Sever21 [200]

That is the answer Y=x^-8x12, xER

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3 years ago

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What is the length of side AD?. . . 6 cm. 8.5 cm. 10.4 cm. 12 cm

ludmilkaskok [199]

In triangle ABC, AC = 12/ (sin30) = 12 / (1/2) = 24
DC = 24-x
DB = DC tan 30 = (24-x) tan30 =(24−x)/√3


In triangle ADB using Pythagorean Theoremx2+((24−x)/√3)2=12^2x2+(24−x)^2/3=12^23x2+(24−x)^2=4324x2−48x+576=4324x2−48x+144=0x2−12x+36=0
x1 = x2 =6

AD = AC - DC = 24- (24-x) = 6

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3 years ago

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