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4 years ago

Which One Doesn't Belong? Why?

Mathematics

2 answers:

Tanya [424]4 years ago

6 0

Answer:

C because the line doesn't touch the x axis

Step-by-step explanation:

makkiz [27]4 years ago

3 0

Correct answer: C
Explanation: the rest of the lines have contact with the x and y axis but as for C it starts from (0,0) and goes upward.

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If y varies directly as x, and y is 6 when x is 72, what is the value of y when x is 8

LiRa [457]

The answer to this problem is 100

3 0

3 years ago

I've been working on this for 2+ hours, so frustrated, my last tutor got it wrong too.

disa [49]

Answer:

Step-by-step explanation:

sin(28) sin(x)

---------- = -----------

7 5

sin(28)* 5 = 7sin(x)

---------------------------

sin(28) * 5

---------------- = sin(x)

You have to seperate sin from (x). When you do that, it becomes inverse (sin^-1).

sin(28) * 5

sin^-1 (------------------) = x

Imput that into you calculator, and you should get 19.59302173 (20 to the nearest degree)

Hope this helps.

6 0

3 years ago

Show that cos(3theta) = 4cos3(theta) − 3cos (theta).

Delvig [45]

<u>Step-by-step explanation:</u>

To prove:

$\cos 3\theta=3\cos^3 \theta-3\sin^2 \theta\cos \theta$

Identities used:

$\cos(A+B)=\cos A\cos B+\sin A\sin B$ ......(1)

$\sin 2A=2\sin A\cos A$ ........(2)

$\cos 2A=\cos^2A-\sin^2 A$ .......(3)

$\sin^2A+\cos^2A=1$ .......(4)

Taking the LHS:

$\Rightarrow \cos 3\theta=\cos (\theta +2\theta )$

Using identity 1:

$\Rightarrow \cos (\theta +2\theta )=\cos \theta \cos 2\theta-\sin \theta \sin 2\theta$

Using identities 2 and 3:

$\Rightarrow \cos \theta (\cos ^2\theta-\sin^2 \theta )-\sin \theta (2\sin \theta \cos \theta )\\\\\Rightarrow \cos^3\theta -\sin^2\theta \cos \theta -2\sin^2 \theta \cos \theta \\\\\Rightarrow \cos^3\theta -3\sin^2\theta \cos \theta$

Using identity 4:

$\Rightarrow \cos^3\theta -3(1-\cos^2\theta) \cos \theta\\\\\Rightarrow \cos^3\theta-3\cos \theta+3\cos^3\theta\\\\\Rightarrow 4\cos^3\theta -3\cos \theta$

As, LHS = RHS

Hence proved

5 0

3 years ago

For science class Brody measured the growth of a leaf. At the beginning of the month the leaf was 6.36 cm long. At the end of th

Alex73 [517]

Answer:

0.91 cm

Step-by-step explanation:

8 0

3 years ago

Read 2 more answers

What is the slope of the line?

defon

Answer:

4/5

Step-by-step explanation:

Slope(m) = (y2-y1)/(x2-x1)

Pick two points on your graph that are closest to clear values. (By that I mean you shouldn't pick points that aren't obvious unless you have to.)

For instance, I see the points (-2,0) and (3,4) to be clear; so we don't have to approximate anything.

You could plug these in in a any order but I'm going to let Point 1=(-2,0) and Point 2=(3,4). So:

m=(4-0)/(3--2)=(4/5)

Slope=4/5

7 0

3 years ago