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Temka [501]
3 years ago
11

HelPPP I need ANSWERS DUEE TOMORROW

Mathematics
1 answer:
aleksley [76]3 years ago
3 0
7. 233
8. 4
9. 6
10. 5
11. 4
12. 7
13. 7
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Because Charles David Keeling and his new colleagues began measuring CO2 in 1958, we now have an excellent record of how CO2 con
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Answer:

1. 516 ppm; 2. 561 ppm

Step-by-step explanation:

1. CO₂ increase at old rate

Time = 2100 - 2010 = 90 years

Increase in CO₂ = 90 yr × (1.4 ppm/1 yr) = 126 ppm

CO₂ in 2010 = 390 + 126 = 516 ppm

At the old rate, the CO₂ concentration in 2100 will be 516 ppm.

2. CO₂ increase at new rate

Time = 2100 - 2010 = 90 years

Increase in CO₂ = 90 yr × (1.9 ppm/1 yr) = 171 ppm

CO₂ in 2010 = 390 + 171 = 561 ppm

At the new rate, the CO₂ concentration in 2100 will be 561 ppm.

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3 years ago
Cost of 5 m ribbon = 7.5 and cost of 1 m ribbon is​
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1.50

Step-by-step explanation:

7.5 is <em>1.5</em><em> </em><em>x</em><em> </em>5 so, 1 x 1.5 = 1.5

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2×-y when ×= when 5 and y=12
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25-12=13 because if x=5 and y=12 just replace the letters with the numbers. Hope it helps mate

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