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AnnyKZ [126]
3 years ago
15

How are patterns used to solve problems?

Mathematics
1 answer:
rosijanka [135]3 years ago
3 0
Patterns can help muliply and divide. For an example say your problem is 6x2 you can do 2+2+2+2+2+2. Or if your problem is 21 divided by 3 you could do 21-3 untill you get to zero and count how many time you had to subtract.
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It was -5 degrees Celsius in Copenhagen and -12 degrees Celsius in Oslo. Which city was colder? *
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Answer: Oslo was colder

Step-by-step explanation: The other one was -5 and this won is -12 so Oslo is colder!! Hope it helped! :)

8 0
2 years ago
A science teacher has a supply of 5% hydrochloric acid and a supply of 65% hydrochloric acid(HC1). How much of each solution sho
Sphinxa [80]
Assume that the amount needed from the 5% solution is x and that the amount needed from the 65% solution is y.

We are given that, the final solution should be 42 ml, this means that:
x + y = 42 ...........> equation I
This can also be written as:
x = 42-y .......> equation II

We are also given that the final concentration should be 45%, this means that:
5% x + 65% y = 45% (x+y)
0.05x + 0.65y = 0.45(x+y)


We have x+y = 42 from equation I, therefore:
0.05x + 0.65y = 0.45(42)
0.05x + 0.65y = 18.9 .........> equation III

Substitute with equation II in equation III as follows:
0.05x + 0.65y = 18.9
0.05(42-y) + 0.65y = 18.9
2.1 - 0.05y + 0.65y = 18.9
0.6y = 18.9 - 2.1
0.6y = 16.8
y = 28 ml

Substitute with y in equation II to get x as follows:
x = 42-y
x = 42 - 28
x = 14 ml

Based on the above calculations:
amount of 5% solution = x = 14 ml
amount of 65% solution = y = 28 ml
The correct choice is:
The teacher will need 14 mL of the 5% solution and 28 mL of the 65% solution.
6 0
3 years ago
Please help me with these two i have to send it after class!!!!!
scoundrel [369]

the first one is the answer to #1

and the second one is the answer to #2

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3x-2 when x=-2 whats the answer
Hoochie [10]

Answer:

3x - 2 \\ 3( - 2) - 2 \\  - 6 - 2 \\  - 8            .answer

Step-by-step explanation:

please mark me brainliest please

7 0
3 years ago
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