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Inessa [10]
3 years ago
15

Solve the equation using the Properties of Equality: 15a = – 2

Mathematics
1 answer:
Lostsunrise [7]3 years ago
3 0

Answer:

          2

a =  -  ------

         15

Step-by-step explanation:

15 a = -2  (divide 15 on each side)

15a           2

-----  =  - ------

15            15

          2

a =  -  ------

         15

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7/13

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A sum of money is invested at 12% compounded quarterly. About how long will it take for the amount of money to double?
iVinArrow [24]
I'll use my own formula (similar to yours tho)

A=P(1+ \frac{r}{n})^{nt}
A=future amount
p=invested
r=rate in decimal
n=number of times per year compounded
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so
when will A=2P
subsitute 2P for A
also quarterly means 4 times a year or n=4
and 12%=0.12=r
so

2P=P(1+ \frac{0.12}{4})^{(4*t)}
divide both sides by P
2=(1+ \frac{0.12}{4})^{(4*t)}
simplify
2=(1+ 0.03)^{4t}
2=(1.03)^{4t}
take the ln of both sides
ln(2)=ln(1.03)^{4t}
ln(2)=4tln(1.03)
ln(2)=t(4ln(1.03))
divide both sides by 4ln(1.03)
\frac{ln(2)}{4ln(1.03)}=t
use calculator
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vesna_86 [32]

Answer:

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8 0
3 years ago
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