Find the number of positive three-digit even integers whose digits are among 9, 8, 7, 5, 3, and 1. 3 36 25

Compare these two waves: the blue and orange waves have the same pitch, but the blue wave is louder. the blue and orange waves have the same volume, but the blue wave has a higher pitch. the orange wave has a higher pitch, but the blue wave is louder. the blue wave has a higher pitch, but the orange wave is louder.

Can someone me and do the problem plz so i can understand it more better

If 3x+8=3x+8 is it one solution or no solution