Here's your activity in math.
1. The average temperature for six days was 23 degrees. What must be the temperature be on the seventh day to make the average temperature during the seven days 21 degrees?

2. If the average weight of four truckloads was 1300 kilograms, what would the average weight of the next three loads need to be make 1380 kilograms the average weight for the five loads?

3. If the total weight of the three roasts is 7.3 kilograms,what would a fourth roast need to weigh for their weights to average 2.5 kilograms?

4. A volleyball team averaged 15 points per game for their first four games of the season. What will the average score of their next three games need to be in order to bring their average up to 60 points per game?​