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3 years ago

Plzzzzzzzz help for a brainly

Mathematics

2 answers:

alexandr402 [8]3 years ago

8 0

Answer:

The first one is supplementary

The second one is complementary

The third one is vertical

Step-by-step explanation:

Fed [463]3 years ago

6 0

Answer:

First answer is supplementary.

second answer is complementary.

Third answer is Vertical.

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Six times Jason's collection of books and one-third of Nathan's collection add up to 134 books. One-third of Jason's collection

siniylev [52]

6j+ $\frac{1}{3}$ n=134

$\frac{1}{3} j+n=31$ you multiply this by 18

6j+18n=558
6j+1/3*n=134
___________(-)

53n/3=424 => 53n=1272 => n=24

You put n in the first equation:
6j+8=134
6j=126 => j=21

Final answer: Nathan has 24 books and Jason 21.

3 0

3 years ago

Verify the identity. cot(x - pi/2) = -tan(x)

gizmo_the_mogwai [7]

Answer:

See below.

Step-by-step explanation:

$\cot(x-\frac{\pi}{2})=-\tan(x)$

Convert the cotangent to cosine over sine:

$\frac{\cos(x-\frac{\pi}{2} )}{\sin(x-\frac{\pi}{2})} =-\tan(x)$

Use the cofunction identities. The cofunction identities are:

$\sin(x)=\cos(\frac{\pi}{2}-x)\\\cos(x)=\sin(\frac{\pi}{2}-x)$

To convert this, factor out a negative one from the cosine and sine.

$\frac{\cos(-(\frac{\pi}{2}-x ))}{\sin(-(\frac{\pi}{2}-x))} =-\tan(x)$

Recall that since cosine is an even function, we can remove the negative. Since sine is an odd function, we can move the negative outside:

$\frac{\cos((\frac{\pi}{2}-x ))}{-\sin((\frac{\pi}{2}-x))} =-\tan(x)\\-\frac{\sin(x)}{\cos(x)} =-\tan(x)\\-\tan(x)\stackrel{\checkmark}{=}-\tan(x)$

8 0

3 years ago

What two consecutive whole numbers lie between the square root of 55?

Kamila [148]

$\boxed{7 \ \textless \ \sqrt{55} \ \textless \ 8}\\\\because\ 7^2=49 \ \textless \ 55\ and\ 8^2=64 \ \textgreater \ 55$

6 0

3 years ago

Read 2 more answers

Can you help me with this one?

True [87]

Haven’t done this in a while but the first is rational, second is irrational, third is rational, fourth is irrational, fifth is rational, sixth is rational, seventh is irrational

5 0

3 years ago

An alloy consists of nickel, zinc, and copper in the ratio 2:7:9. How many pounds of nickel have to be used to create alloy that

Hunter-Best [27]

We are given ratio nickel to zinc to copper = 2:7:9.

From this ratio we can see that <em>ratio of nickel to zinc is 2:7</em>.

Let us assume number of pounds of nickel have to be used to create alloy that contains 4.9 lb of zinc is x pounds.

So, we can setup a proportion as :

x : 4.9 = 2:7

$\frac{x}{4.9}=\frac{2}{7}$

On cross multiplication, we get

7x= 4.9× 2

7x = 9.8

Dividing both sides by 7, we get

x = 1.4.

<h3>Therefore, 1.4 pounds of nickel have to be used to create alloy that contains 4.9 lb of zinc.</h3><h3 />

6 0

3 years ago