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natita [175]
2 years ago
6

20 years ago, father's age was 5 times his son's age. Now his age is 10 years more than twice his son's present age. Find their

present ages. ​
Mathematics
1 answer:
Montano1993 [528]2 years ago
6 0

Step-by-step explanation:

x = father's age now

y = son's age now

x = 2y + 10

x - 20 = 5(y - 20) = 5y - 100

using the first in the second equation :

2y + 10 - 20 = 5y - 100

-10 = 3y - 100

90 = 3y

y = 30

x = 2y + 10 = 2×30 + 10 = 60 + 10 = 70

the father is now 70 years old, the son now 30 years old.

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Answer:

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Step-by-step explanation:

The sequence values have a first term of 6 and a common ratio of 3, so can be described by the formula ...

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This can be rearranged to ...

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To find when there are 486 pennies saved, we can solve the equation ...

  486 = 2·3^n

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Tabitha will have saved 486 pennies after 5 weeks.

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3 years ago
Tammy received a $70 gift card for a coffee store. She used it in buying some coffee that cost $8.41 per pound. After buying the
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Total money Tammy has = $70

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