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lys-0071 [83]
3 years ago
5

The lengths of the sides of an 5m by 5m square are increased by 3m. The area of the square has increased by what percent? Please

answer and explain. Thanks! :)
Mathematics
1 answer:
Alex Ar [27]3 years ago
3 0
Well you first have to find the area of the first square so do 5 times 5 which equals 25. Then you have to add 3 to 5 which is 8, so each side equals 8 meters. Next time 8 by 8 which equals 64, then do 64-25 which equals 39. Then put the change over original so do 39 divided by 25 which equals your percent of change 1.56 or 156% increase.
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Answer:

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Step-by-step explanation:

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0 = b

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y =  -\frac{3}{4}x + 0

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8 0
3 years ago
A pond has 150 fish and the population decreases by 8% each day. How many days before there are 30 fish
nlexa [21]

Answer:

19 days

Step-by-step explanation:

Given

a = 150 --- initial

r = 8\% -- rate

Required

Days when the fish gets to 30

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y = ab^x

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Because the fishes decreases;

b = 1 - r

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b = 1 - 8\%

Express as decimal

b = 1 - 0.08

b = 0.92

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y = 30

b = 0.92

So, we have:

30 = 150 * 0.92^x

Divide both sides by 150

0.2 = 0.92^x

Take log of both sides

log(0.2) = log(0.92^x)

Apply law of logarithm

log(0.2) = x\ log(0.92)

Make x the subject

x = \frac{log(0.2)}{log(0.92)}

x = \frac{-0.6990}{-0.0362}

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x \approx 19

<em>Hence, it takes approximately 19 days</em>

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3 years ago
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Step-by-step explanation:

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8 0
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