Answer:
[tex]3\leq x\leq17[/tex]Explanation:
Given the side lengths of the triangle to be 7 and 10, the greatest the length of the third side of the triangle can be is 17 which is the sum of the two other side lengths(7 + 10 = 17) and the least the third side length can be is 3, which is the difference between the two given side lengths(10 - 7 = 3). So the range of possible values for the third side, say x, can be written as;
[tex]3\leq x\leq17[/tex]