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zepelin [54]
3 years ago
6

Willing to Mark brainiest!

Mathematics
1 answer:
melisa1 [442]3 years ago
8 0

Answer: 2 • 2 • 3 • 3

Step-by-step explanation:

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Suppose two initial vectors intersect at a right angle and form a resultant vector. The magnitudes of one initial vector, A, and
Vlad [161]

Answer:

Step-by-step explanation:

B = √(R² - A²)

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3 years ago
How much arms altogether does the octopus have?
vazorg [7]
An octopus has 8 tentacles
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Please help me with this. I thought the answer was 9 but I was wrong.
Lilit [14]

I think your answer is 28

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3 years ago
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One container of Tums® costs 4.00 dollars. Each container has eighty 1.00 g tablets. Assume each Tums® is 40.0 percent CaCO₃ by
Anna007 [38]

Answer:

The total cost is 1.25 dollars.

Step-by-step explanation:      

The reaction between HCl and CaCO₃ is giving by:

2HCl(aq) + CaCO₃(s)   →   CaCl₂(aq) + CO₂(g) + H₂O(l) (1)

0.500L     M: 100.01g/mol        

0.400M

According to equation (1), 2 moles of HCl react with 1 mol of CaCO₃, so to neutralize HCl, we need the next amount of CaCO₃:

m CaCO_{3} = (\frac{1 \cdot mol HCl}{2}) \cdot M_{CaCO_{3}} = (\frac{0.500L \cdot 0.400 \frac {mol}{L}}{2}) \cdot 100.01 \frac{g}{mol} = 10.001 g      

The CaCO₃ mass of each tablet is:

m CaCO_{3} = 1 g_{tablet} \cdot \frac{40g CaCO_{3}}{100g_{tablet}} = 0.4g

Hence, the number of tablets that we need to neutralize the HCl is:

number_{tablets} = ( \frac{1 tablet}{0.4 g CaCO_{3}}) \cdot 10.001g CaCO_{3} = 25  

Finally, if every 80 tablets costs 4.00 dollars, 25 tablets will cost:

cost = (\frac {4 dollars}{80 tablets}) \cdot 25 tablets = 1.25 dollars

<u>So, the total cost to neutralize the HCl is 1.25 dollars.</u>

I hope it helps you!

7 0
3 years ago
A woman walks a constant speed of 4.5km per hour. How long will it take her to walk 10 km? Use the formula d=st. write the answe
ryzh [129]

d =st

distance = speed * time

10 = 4.5 * t

divide each side by 4.5

10/4.5 = t

100/45 = t  (can't have a decimal in a fraction so I multiply by 10/10)

divide top and bottom by 5

20/9

2 and 2/9 hours

 to get minutes multiply 2/9 by 60

2/9 * 60

120/9

13 3/9

13 1/3 minutes

2 hours 13 1/3 minutes

to the nearest minutes

2 hours 13 minutes

4 0
3 years ago
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