For how many integer values of n will the value of the expression 4n + 7 be an integer greater than 1 and less than 80?
Choose one
A) 24	B) 26	C) 20	D) 22	E) 18
4n+7 &gt; 1   4n&gt; -6   n &gt; -(3/2)   n&gt; -1.5 (n = -1, 0, 1 ,2 3........ upto infinity)   From second constraint   4n+7 &lt; 80   4n&lt; 73   n &lt; 18. 25   n = (-infinity, .......-3, -2, -1, 0, 1, 2, .........upto 18)   Combining the two   -1.5 &lt; n&lt;18.25   n = 1 to 18 (18 integers)   and n = -1 and 0   so 20 integers.   20 is the answer
<result>C</result>
For how many integer values of n will the value of the expression 4n + 7 be an integer greater than 1 and less than 80?