Bella pays 7 payments of $5 each to a game store. She returns one game and receives 20 dollars back. What is the change to the amount of money she has?
Ron lost 10 points seven times playing a video game. He then lost an additional 100 points for going over the time limit. What was the total change in his score?
Ned took a test with 25 questions. He lost 4 points for each of the 6 questions he got wrong and earned an additional 10 points for answering a bonus question correctly. How many points did Ned receive or lose overall?
Mr. Harris has some money in his wallet. He pays the babysitter $12 an hour for 4 hours of babysitting. His wife gives him 10, and he puts the money in his wallet. By how much does the amount in his wallet change?
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