8 + 2(10 - r) = 8 + 20 - 2r = 28 - 2r
Answer:
7464.42
Step-by-step explanation:
looked it up
Answer:
The percentage increase in bird population in the second years is 4% .
Step-by-step explanation:
Given as :
During two years, the population of birds of an island became 7 times more than before.
The the percentage increase in first year = =
=40%
Let The percentage increase in second year =
= r%
So, According to question
The initial population of bird = x
The increase population of bird =7 times before = 7 x
Now,
The increase population of bird = initial population of bird × (1+
) × (1+
)
Or, 7 x = x × (1+
) × (1+
)
Or,
= 1.4 × (1+
)
Or, 7 = 1.4 × (1+
)
Or,
= (1+
)
Or, 5 = (1+
)
Or, (1+
) = 5
Or,
= 5 - 1
Or,
= 4
∴ r = 4 × 100
I.e r = 400
so, The percentage increase = r% = 4
Hence The percentage increase in bird population in the second years is 4% . Answer
Answer:
square root of 7
Step-by-step explanation:
2 times 2 is 4
3 times 3 is 9
7 is the only option between 4 and 9
(this was more the easy method lol but hope this helps)
Yes, he is correct. 0.003 * 10 = 0.03