0.84 as an improper fraction

Need ! easy 6th grade work! i will put as much points as i can! you so much! i’m learning this in math and it’s soo

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.

If f(x)=3x+1 and f^-1=x-1/3, then f^-1(7)=