Can you put parenthesis inside parenthesis

Add the two expressions 3.8b - 7 and 2.9b + 9 enter your answer in simplified form

Due to bad planning, two of the local schools have their annual plays on the same weekend. while 457 people attend one, and 372 attend the other, only 104 people were able to attend both. how many people went to at least one play?

Jayne is studying urban planning and finds that her town is decreasing in population by 3% each year. the population of her town is changing by a constant rate.true or false?