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3 years ago

I need help 1. 2. 3.

Mathematics

1 answer:

Reptile [31]3 years ago

4 0

1. North America, Africa, Asia, Europe

2. South America, Antarctica, and Australia

3. North America, South America and Antarctica.

You might be interested in

I don’t understand can someone please explain how to work this out and what the answer is

joja [24]

When you see an equation with parenthesis around it, you can use this:

Parenthesis

Exponents

Multiplication

Division

Addition

Subtraction

Otherwise known as PEMDAS.

We can see that in the equation, there are parenthesis, so we can open those. We open parenthesis by taking the number right next to the parenthesis (or outside the parenthesis) and we multiply that number by everything inside. So this is what it would look like:

-2x^2 - 10x + 8

See how the signs changed? This rule only applies when you multiply something, but here is how I think of it:

+ and + always equals +.

- and - always equals +.

- and + always equals -.

+ and - always equals -.

So that's it! Just to be clear, the answer is:

-2x^2 - 10x + 8

Hope I helped, sorry if I'm wrong!

`Mschmindy

4 0

3 years ago

PLEASE HELP DUE IN 1 HOUR

kobusy [5.1K]

Choosing blue or red: 3 blue + 4 red = 7 marbles
3 blue + 2 green + 4 red + 1 yellow = 10 marbles

Probability blue or red marble: 7/10

Choosing a marble that isn't blue or red: 2 green + 1 yellow = 3 marbles
Total marbles: 3 blue + 2 green + 4 red + 1 yellow = 10 marbles

Probability non-blue or red marble: 3/10

5 0

3 years ago

I need the answer asap pls! :)

AfilCa [17]

Answer:

18m

Step-by-step explanation:

Since the given traingles are similar

We get

$\frac{JK}{MN} = \frac{KL}{ML}$

$\frac{JK}{42} = \frac{21}{49}$

$JK = \frac{21 \times 42}{49}$

$JK = \frac{3 \times 7 \times 6 \times 7}{7 \times 7}$

$JK = 3 \times 6 = 18$

$JK = 18$

Hence the distance across river is 18m

7 0

1 year ago

Ashley has $62, part of which she wants to use to pay back the money she owes people. She owes $13 to her brother and she owes $

laila [671]

Answer:

Step-by-step explanation:

Amount at hand = $62

Amount owed = $13 + $39

= $52

$62 - $52

= $10

5 0

2 years ago

Y A chemist can purchase a 10% saline solution in 500 cubic centimeter containers, a 20% saline solution in 500 cubic centimeter

Nonamiya [84]

Step-by-step explanation:

ultimately you need to end up with 30% solution

with 10%, 20%, and 50%, you are forced to tamper with the various percentages to reach the desired goal.

Since it is an even 12,000 (i.e. no 12500) and you have no hard container volumes to deal with, therefore find the easiest combination to reach 30%. In this case, (10%+50%)/2 = 30%

So therefore you need 12000 cubic centimeters of liquid, half of it being 50% and half being 10%.

12000/2 = 6000 cubic centimeters each

for 50%, each container is 1,000 cubic centimeters, so 6000/1000 =6 containers for 10% each container is 500 cubic centimeters, so 6000/500 = 12 containers

Therefore, you need 6 containers of 50% solution and 12 containers of 10% solution.

7 0

3 years ago