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olga nikolaevna [1]
3 years ago
9

Given 10k -4 =2k-20 prove k=-2

Mathematics
2 answers:
xeze [42]3 years ago
8 0

Answer:

10k-4=2k-20

     +4       +4

10k=2k-16

-2k  -2k

8k=-16

\frac{8k}{8}=\frac{-16}{8}

k=-2

Check:

10(-2)-4=2(-2)-20

-20-4=-4-20

-24=-24  

Step-by-step explanation:

RoseWind [281]3 years ago
3 0

Answer:

10.k-4=2.k-20

10k-2k=-20+4

8k=-16

K=-2

Step-by-step explanation:

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Answer:

The time required to get  a total amount of $ 640.00  from compound interest on a principal of $ 440.00  at an interest rate of 5.6% per year  and compounded 365 times per year  is approximately 7 years.

Step-by-step explanation:

Given

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  • Interest rate r = 5.6% = 0.056
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To determine:

Time period t = ?

Using the formula

A\:=\:P\left(1\:+\:\frac{r}{n}\right)^{nt}

solving for t

t = ln(A/P) / n[ln(1 + r/n)]

substituting the values A = 640, P = 440, n = 365 and r = 0.056

t = ln(640/440) / ( 365 × [ln(1 + 0.00015342465753425/365)] )

t = 6.691

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