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dedylja [7]
3 years ago
7

Lane is 10 times Mel's age. If the difference in their age is 27, how old is Mel?

Mathematics
1 answer:
postnew [5]3 years ago
5 0
L - Lane's  age
m- Mel's  age. 
Lane is 10 times Mel's age, so  10m = l 
difference in their age is  27 so  l - m = 27 
Substitute  l = 10m  and you'll have:
10m - m = 27
9m = 27    /:9
m=3 
And  l = 10m = 10*3 = 30

So Lane has 3 years old and Mel has  30 years old. 
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Hey so im also looking for the first answer and the choices were “ is not “ and “ is “
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so the investigator found the skid marks were 75 feet long hmmm what speed will that be?

s=\sqrt{30fd}~~ \begin{cases} f=\stackrel{friction}{factor}\\ d=\stackrel{skid}{feet}\\[-0.5em] \hrulefill\\ f=\stackrel{dry~day}{0.7}\\ d=75 \end{cases}\implies s=\sqrt{30(0.7)(75)}\implies s\approx 39.69~\frac{m}{h}

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s=\sqrt{30fd}~~ \begin{cases} f=\stackrel{friction}{factor}\\ d=\stackrel{skid}{feet}\\[-0.5em] \hrulefill\\ f=\stackrel{dry~day}{0.7}\\ s=35 \end{cases}\implies 35=\sqrt{30(0.7)d} \\\\\\ 35^2=30(0.7)d\implies \cfrac{35^2}{30(0.7)}=d\implies 58~ft\approx d

4 0
3 years ago
Ernest borrowed $1000 from the bank. The interest rate is 30% and he borrowed it for 9 months. How much will he owe the bank?
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The total amount Ernest owes the bank after 9 months is $1,225.00

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