The model shows the addition expression 18 + 12. One expression that is equivalent to this sum is _ .

If sec theta = 5/3 and the terminal point determined by theta is in quadrant 4, then

Aquadratic equation in standard from is written ax^2= bx+c, where a,b and c are real numbers and a is not zero?

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?