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sveticcg [70]
3 years ago
8

ryan and karl spent 28 hours building a tree house. ryan worked 4 more hours than karl. how many hours did each work

Mathematics
2 answers:
Snezhnost [94]3 years ago
6 0
Ryan worked 18  hours while karl worked ten
\
Alexxx [7]3 years ago
6 0
Each person work 12 hours but ryan worked an extra 4 hours so ,ryan worked a total of 16 hours

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(a) Suppose you have 9 gold coins that look identical, but you also know one (and only one) of them is counterfeit. The counterf
alisha [4.7K]

Answer:

Step-by-step explanation:

You can split the coins into 3 groups, each of them has 3 coins. Weigh group 1 vs group 2, if one is lighter, that group has the fake coin. If both groups weigh the same, then group 3 has the fake coin.

Continue to split the group that has the fake coin into 3 groups, each group has 1 coin. Now apply the same procedure and we can identify the fake coin.

Total of scale usage is 2

b) if you have 3^n coins then you can apply the same approach and find the fake coin with just n steps. By splitting up to 3 groups each step, after each step you should be able to narrow down your suspected coin by 3 times.

Step 1: you narrow down to group of \frac{3^n}{3} = 3^{n-1} coins

Step 2: you narrow down to group of \frac{3^{n-1}}{3} = 3^{n-2} coins

Step 3: you narrow down to group of \frac{3^{n-2}}{3} = 3^{n-3} coins

...

Step n: Step 1: you narrow down to group of 3^{n-n} = 3^0 = 1coin

8 0
3 years ago
Please help I got the answer wrong-
puteri [66]

Answer:

x {}^{2}  = 150

Step-by-step explanation:

What I did was

5 \times 5 = 25

then I did

5 \times 5 = 25 \times 5 = 150

and I'm hoping 150 is the answer. HOPE THIS HELPED

8 0
3 years ago
Can some one explain how to answer this
Softa [21]
You would first have to find the area of the other part.

6 0
3 years ago
What is 3 1/2 - 2 5/7 and show the work
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