Please help me out on this one

Try this triangle: 3ft, 4ft, and 1 ft

Is the first plus second greater than the third? Is 3+4> 1?
Is the second plus third greater than the first ? is 4+1 >3?
Is the third plus first greater than the second? Is 3+1 >4
Can it make a triangle? Explain why?

What is the prime factorization of 195

Nick has box brads. he uses 4 brads for the first project. nick let’s b represent the original number of brads and finds that for the second project, the number of brads he uses is 8 more than half the difference of b and 4. write an expression to represent the number of brads he uses for the second project.

Offering 30 if a plus b plus c equals 68 and ab plus bc plus ca equals 1121, where a, b, and c are all prime numbers, find the value of abc. the answer is 1978 but i need an explanation on how to get that.