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2 years ago

What is the answer for number 7

Mathematics

1 answer:

Ivanshal [37]2 years ago

5 0

Answer:

x = -35

Step-by-step explanation:

add 3 to both sides.

$\frac{2}{5}$ x - 3 + 3 = -17 + 3

$\frac{2}{5}$ x = -14

multiply both sides by $\frac{5}{2}$ .

( $\frac{5}{2}$ ) · ( $\frac{2}{5}$ x) = ( $\frac{5}{2}$ ) · (-14)

x = -35

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marusya05 [52]

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<h3>How to determine the domain and the range of the function?</h3>

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2 years ago

In 2018, the population will grow over 700,000.The population of a city in 2010 was 450,000 and was growing at a rate of 5% per

Firlakuza [10]

Answer:

The year is 2020.

Step-by-step explanation:

Let the number of years passed since 2010 to reach population more than 7000000 be 'x'.

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Taking log on both sides, we get:

$\log(P)=\log(P_0(1+r)^x)\\\log P=\log P_0+x\log (1+r)\\x\log (1+r)=\log P-\log P_0\\x\log(1+r)=\log(\frac{P}{P_0})\\x=\frac{\log(\frac{P}{P_0})}{\log(1+r)}$

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Therefore, the tenth year after 2010 is 2020.

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