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LenKa [72]
3 years ago
7

Keith spent 1/5 of this money on a story book. He gave $26.80 to his brother and had 1/2 of his money left. How much money did h

e have left?
Mathematics
2 answers:
Mama L [17]3 years ago
6 0
1/5 = 2/10
1/2 = 5/10

2/10 of his money on a story book.
Storybook is the variable x

$26.80 to his brother (5/10 of his money left)

5/10-2/10 = 3/10

$26.80x3/10= 8.04

He had $8.04 left.
Aleks04 [339]3 years ago
3 0
Not really sure of this one but i think it's like this- 
2/10 (money for story) + 3/10 (26.80 dollars to brother)= 1/2 of his money
3/10x=26.80  268=3x ; x= 89.33333....
89.33 X 5/10= answer
money left= (roughly) 44.67
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5 0
2 years ago
The rabbit population of Springfield, Ohio was 144,000 in 2016. It is expected to decrease by about 7.2% per year. Write an expo
xeze [42]
<h2>Hello!</h2>

The answer is:

In 2036 there will be a population of 32309 rabbits.

<h2>Why?</h2>

We can calculate the exponential decay using the following function:

P(t)=StartAmount*(1-\frac{percent}{100})^{t}

Where,

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Percent, is the decay rate.

t, is the time elapsed.

We are given:

StartAmount=144,000\\x=7.2(percent)\\t=2036-2016=20years

Now, substituting it into the equation, we have:

P(t)=StartAmount(1-\frac{percent}{100})^{t}

P(t)=144000*(1-\frac{7.2}{100})^{20}

P(t)=144000*(1-0.072)^{20}

P(t)=144000*(0.928)^{20}

P(t)=144000*(0.928)^{20}

P(t)=144000*0.861=32308.888=32309

Hence, we have that in 2036 the population of rabbis will be 32309 rabbits.

Have a nice day!

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