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2 years ago

Grade 8 math question plz show work

Mathematics

1 answer:

Nimfa-mama [501]2 years ago

6 0

A. The population would be 120

You would find 20 percent of 100
To do that, you do 100× 0.2 and add that to 100

B. The population doubles

10×2= 20
20×2= 40, not 30

hope this helps!

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Factor the trinomial 2x^2+15x+7

Mashutka [201]

Answer:

(2x+1)(x+7)

Step-by-step explanation:

2x2+15x+7

For a polynomial of the form ax2+bx+c

, rewrite the middle term as a sum of two terms whose product is a⋅c=2⋅7=14 and whose sum is b=15

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2x2+x+14x+7

Factor out the greatest common factor from each group.

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x(2x+1)+7(2x+1)

Factor the polynomial by factoring out the greatest common factor, 2x+1

(2x+1)(x+7)

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2 years ago

Which of the following is equivalent to \root(5)(13^(3))

kicyunya [14]

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2 years ago

FIND PR.PLS HELP BRAINLIEST...

slega [8]

Answer:

6.2 units.

Step-by-step explanation:

We are given two angles and an opposite corresponding side. To solve for an unknown side, we can use the law of sines.

$\frac{8}{sin(90)}=\frac{x}{sin(180-39-90)}=\frac{x}{sin(51)}$

Cross multiplying and solving will get you this:

$x=\frac{8(sin(51))}{sin(90}$

Which can simplify to:

$x=8(sin(51))$

Which putting into a calculator gets you:

$x=6.2$

So the line PR is 6.2 units long.

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3 years ago

I need help. Do not put up a link to a site. (No sin/cos/tan)

melomori [17]

Answer:

the answer is x=60 y=90

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2 years ago

Read 2 more answers

A boat travels 12 Mph in still water. It can travel 18 miles upstream in the same time that it can travel 24 miles downstream. W

quester [9]

Answer:

The current of the water is 1.714 mph.

Step-by-step explanation:

Let the boat in t hours can travel 18 miles upstream, and 24 miles downstream.

Therefore, if the speed of the boat in still water is 12 mph and that of water is x mph , then we can write

$\frac{18}{t} = 12 - x$ ........ (1) and

$\frac{24}{t} = 12 + x$ ............ (2)

Now, adding those two equations (1) and (2) we get,

$\frac{18}{t} + \frac{24}{t} = 24$

⇒ t = 1.75 hours.

Now, from equation (1) we get

$\frac{18}{1.75} = 12 - x$

⇒ x = 1.714 mph

Therefore, the current of the water is 1.714 mph. (Answer)

4 0

3 years ago