4 years ago

Janessa bought 4 stamps for $1.48 at this rate how much would 10 stamps cost

1 answer:

5 0

Answer: $3.7

Step-by-step explanation:

1.48 / 4 = 0.37

0.37 * 10 = 3.7

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kherson [118]

The explicit formula of an arithmetic sequence:

$a_n=a_1+(n-1)d$

We have:

$a_1=-100,\ a_2=-70,\ a_3=-40;\ a_4=-10,\ ...\\\\d=a_{n+1}-a_n\to d=-70-(-100)=-70+100=30$

Substitute:

$a_n=-100+(n-1)(30)=-100+30n-30=30n-130$

Answer: an = 30n - 130

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snow_lady [41]

Ok so what you need to do is divide 20 and 120 and that will help you get t :)

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$\bf \stackrel{width}{11.25}=0.75\stackrel{length}{L}\implies \cfrac{11.25}{0.75}=L\implies 15=L$

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