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Novosadov [1.4K]
3 years ago
12

In October 2009,there were approximately 5x10^7 members of a website. In January 2013, there were approximately 2x10^8 members.

How many more members were there in January 2013 than in October 2009? Write your answer in scientific notation. There were__________more members in January 2013 than in October 2009.
Mathematics
1 answer:
JulsSmile [24]3 years ago
4 0

Answer:

There\ were\ 1.5\times 10^8\ more\ members\ in\ January\ 2013\ than\ in\ October\ 2009.

Step-by-step explanation:

Number\ of\ members\ in\ October\ 2009=5\times 10^7\\\\Number\ of\ members\ in\ January\ 2013=2\times 10^8\\\\Number\ of\ members\ in\ January\ 2013=2\times 10\times 10^7\\\\Number\ of\ members\ in\ January\ 2013=20\times 10^7

More members in January 2013=Number of members in January 2013-Number of members in October 2009.

The\ number\ of\ members\ that\ are\ more\ in\ January\ 2013=20\times 10^7-5\times 10^7\\\\The\ number\ of\ members\ that\ are\ more\ in\ January\ 2013=(20-5)\times 10^7\\\\The\ number\ of\ members\ that\ are\ more\ in\ January\ 2013=15\times 10^7\\\\The\ number\ of\ members\ that\ are\ more\ in\ January\ 2013=1.5\times 10\times 10^7\\\\The\ number\ of\ members\ that\ are\ more\ in\ January\ 2013=1.5\times 10^8\\\\There\ were\ 1.5\times 10^8\ more\ members\ in\ January\ 2013\ than\ in\ October\ 2009.

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Using distributive property what is the value of the expression for 2(-5 + 3)
Vladimir [108]

Answer:

-4

Step-by-step explanation:

According to the rules of the distributive property, you have to multiply the term outside of the parentheses with the terms inside the parentheses first.

1. 2(-5)=-10    

2. 2(3)=6

The terms that we have are now -10 and 6. Add them together to get the final answer.

-10+6=-4

8 0
2 years ago
An element with mass 970 grams decays by 27.7% per minute. How much of the element is remaining after 13 minutes, to the nearest
Mnenie [13.5K]
Basically, 27.7% of 970 is 268.69 grams, if 13 minutes so i’m pretty sure it’s 268.69 X 13 = 3492.97, it cannot be deduced from 970 unless it became −2522.97, is that the answer ur looking for?
6 0
3 years ago
Can someone help me find surface area??
natita [175]

Answer:

277cm²

Step-by-step explanation:

Base = 9x8=72

There are 2 triangles with a bottom edge of 9 and a slant height of 13:

1/2(9)(13)=58.5

There are 2 triangles with a bottom edge of 8 and a slant height of 11:

1/2(8)(11)=44

72+58.5+58.5+44+44=277cm²

5 0
3 years ago
Please help with 6 and 7
Maru [420]

Answer:

6a) i- 2hrs 36mins  ii- 3hrs 12mins

b) car A≈ 76.9km/h  car B≈ 62.5km/h

c)------

7a) 35km

b) car A=75km  car B=60km

c) 30km

d) car A≈36mins  car B≈48mins

Step-by-step explanation:

6a) Using the graph follow the lines until they finish then go downwards until you get to the x-axis. The x-axis is going up by 12mins for each square.

b) Using the answer from a, you divide 200km by the time.

For car A 2hrs 36mins becomes 2.6 because 36mins/60mins=0.6

∴ car A: 200/2.6≈ 76.92km/h

For car B 3hrs 12mins becomes 3.2 because 12mins/60mins=0.2

∴ car B: 200/3.2≈ 62.5km/h

7a) Using the graph go down from where the line of car A finished to meet car B. The y-axis is going up by 5km for each square.

b) Starting from the x-axis at 1 hour go upwards to see where you meet the car B line (60km) and car A line(75km). (sorry if that does not really make sense).

c) Difference from car A line to car B:

155km-125km=30km

d) Going across from 50km meet car A line and go down to see it has been travelling for approx. 36mins. Then continue across to car B line, go down to see it reached 50km at approx. 48mins.

Hope this helps.

5 0
3 years ago
Can someone help me with this one? it's due today at 9pm and I really don't know it!!! ​
Feliz [49]

Answer:

Radius: 7.5 cm  ;  Diameter: 15 cm

Step-by-step explanation:

The radius of a circle is basically the middle "halfway" point and in this case, it has already been given, 7.5 cm. The diameter is the middle line of the circle and to find the diameter, you must multiply the radius by 2, which is essentially 7.5 cm*2, and this gives you a diameter of 15 cm.

Hope this helps! :D

6 0
1 year ago
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