KC= 31-10= 21
21÷2=10.5
KN= 10.5×4=42
42+1=43
KN=43
We use the negative exponent rule to change an expression with a negative exponent to an equivalent expression with a positive exponent. The rule states that any nonzero number raised to a negative power equals its reciprocal raised to the opposite positive power.
1 and 1/8 of an hour because Alisha took away that amount of time from johns time.<span />