It is easier to do one question at a time
When you divide you get 6.666667 then in fraction it is 20/3 so in mix number 6 2/3.
Answer:

Step-by-step explanation:
Let k represent the price in dollars at which Nita will buy the keyboard.
We have been given Nita wants to buy a new keyboard for her computer. She will buy the keyboard when it is on sale for under $50.
This means that Nita will buy the computer, when its price (k) is less than $50. We know that sign < represents less than.
We can represent our given information in an inequality as:

Therefore, our required inequality would be
.
Answer:
3.75
Step-by-step explanation:
First, divide 325 by 4, which will come out to be 81.25, then take the 85 that his mom gave him and subtract the 81.25 to get your answer, which is, 3.75 :)