How do I regroup the addends for associative property
(5 + 6) + (4 + 7) + 3

Iq scores for adults age 20 to 34 years are normally distributed according to n(120, 20). in what range does the middle 68% of people in this group score on the test?

Find the solution of each of the following.

Zahra runs a 500-meter race at a constant speed. which graph shows her distance from the finish line during the race?