Need help on this, what is the correct name for this number?

Plz ( true - false) all triangles have interior angles whose measure sum to 90.

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?

Look at the chart showing the results of a baseball player at bat. which is the probability of getting a hit?