The current temperature in smalltown is 18 f. this is 4 degrees less than twice the temperature that it was six hours ago. what was the temperature in smalltown six hours ago?

ANSWER:  

The temperature in smalltown six hours ago was 11 F.

SOLUTION:

Given, current temperature in smalltown is 18 F.  

Given that 18 F is 4 degrees less than twice the temperature that it was six hours ago.

We need to find what was the temperature six hours ago.

Let the temperature six hours ago be x.

Given that 18 F is 4 degrees less than twice the temperature that it was six hours ago.

Then, 2x - 4 = 18  

2x = 18 + 4

2x = 22

x =

x = 11 F.

Hence, the temperature in smalltown, six hours ago was 11 F.

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for

step-by-step explanation:

we can analyze the pattern at which the terms increase. let us denote , , , so that we can call

note the following:

the pattern: to get the next term value, we just add the next term number (e.g. 1st, 2nd, to the previous term value (term values are the given numbers in the question, 1, 3, 6, 10, 15,

from , to get to , we add

from , to get to , we add

etc.

we need to form a recursive formula, a formula that has the next term as a function of the previous term. so a possible recursive formula can be

, and for