What is the additive inverse and multiplicative inverse of 15, 1.25, -4/5, and three and 3/4?

Question

I need help on my homework

Answer 1

Additive inverse means the opposite side of the number line.  So, the additive inverse of 15 is -15 and the additive inverse of

-4/5 is 4/5.  I think you can do the rest.

Multiplicative inverse means "flip the fraction."  So, the multiplicative inverse of 15 = 15/1 is 1/15.  The multiplicative inverse of -4/5 is -5/4.  1.25 is a little more tricky.  You need to first turn it into a mixed number.  This would be 1 1/4.  Next you need to turn the mixed number into an improper fraction.  This would be 5/4.  Now you can "flip the fraction."  The multiplicative inverse would be 4/5.  I think you can do the rest.