Three numbers are in arithmetic progression. Their sum is 3 and the sum of their squares is 11. What are the three numbers? I already have -1,1,3. What is the other three?

Asilkworm winds its cocoon out of one long silk fiber. to make silk thread, 3 to 10 of these silk fibers are unwound from their cocoons and combined into aa single thread with a typical length of 300 yards. choose a reasonable number of silk fibers in a thread write an equation to find the total length of the silk fibersused in 300 yards of the thread

Ineeeeed this is due tomorrow and i dont know the answer can you find all the exponents

Asap! i'm not good math and i'm lost.