Determine the missing number for this sequence.

24.5

Step-by-step explanation:

To help find the missing number subtract 19 and 13.5=5.5

Then subtract 5.5 from 30,

30-5.5=24.5

You can test this by subtracting 5.5 from every known number and you should get

30-5.5=24.5,

24.5-5.5=19,

19-5.5=13.5, and so on.

the sum of the lengths of any two sides of a triangle is greater than the length of the third side. if you take the three sides of a triangle and add them in pairs, the sum is greater than (not equal to) the third side. if that is not true, then it is not possible to construct a triangle with the given side lengths.

step-by-step explanation: