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Vlad1618 [11]
3 years ago
7

Lily invested $750 in a savings account and earned $225 in interest at the end of 5 years.

Mathematics
1 answer:
slava [35]3 years ago
4 0
After 5 years Lily has $750+$225 = $975
The equation for interest rate looks like:
750 * x^5 = 975 
x^5 = 975/750
x^5 = 1.3
x = \sqrt[5]{1.3}
x = 1,0538
That means that interest rate is approximately 5,5% (B)

The reason for this calculation is because each year you multiply your money with interest rate and add that to your starting money.
After one year you will earn
750 + 750 * interest rate = money after 1 year.
After 5 years we multiply 5 times so our interest rate is x^5 and money after 5 years is 750 + 225.
 
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fenix001 [56]

1080 clothespins makes 90 chairs and we need to find out how many clothespins it takes to make 1 chair.

We can set up a proportion of the number of chairs to the number of clothespins because of the proportional relationship.

x is the number of clothes pins for 1 chair

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Cross multiply to get

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3 years ago
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Simplify 15.6 divided by negative 3..
MaRussiya [10]
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So divide both numerator and denominator by 3 and you have -5.2.
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4 years ago
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A gasoline pumps delivers 4 2/5 gallons of gas per minute how many minutes will it take to fill a gas data old 16 1/2 gallon
Luba_88 [7]
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Answer:

Amir's car will cost £10348.88 after 23 years.

Step-by-step explanation:

I finally found a UK human!

This is compound interest so you have to find a decimal multiplier and multiply that with £16470 to the power of 23.

The decimal multiplier would be 0.98. This is because you do 100% - 2% as depreciating basically means a decrease, which gives you 98% and then you divide that by 100 to get your decimal multiplier - 0.98.

16470 × 0.98^{23} = £10348.88

I hope that helps you!! ^-^

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