Answer:
5 + k
Explanation:
Kasey can mow the lawn five minutes faster than Trisha
Which means that it takes Trisha 5 MORE minutes then Kasey to mow the lawn
If Kasey mows the lawn in "k" minutes than Trisha will mow the lawn 5 more minutes then "k"
This can also be expressed as an expression: k + 5, as Trisha takes 5 more minutes to mow the lawn