Question 1073367
<pre>
Instead of doing it for you, I'm changing all the numbers so
you can do yours exactly the same way I did this one step by step.
I'm changing it to this problem:
</pre>
How many terms are there between 329 and 843 of an arithmetic 
sequence 9n+7 ?
<pre>
We know that the terms are between 329 and 843, so we write:

{{{329<=9n+7<=843}}}

Subtract 7 from all three sides

{{{322<9n<=836}}}

Divide all three sides through by 9

{{{"35.77..."<=n<="92.88..."}}}

Since n is an integer,

{{{36<=n<=92}}}

There are 92 integers 1 through 92.

We can't use the first 35 integers 1 through 35,

So there are 92-35 or 57 terms between 329 and 843 of 
an arithmetic sequence 9n+7

Now you do yours exactly the same way step by step.

Edwin</pre>