Right triangles and trigonmetry

Afamily has five members. a mom, a dad, two sisters, & a brother. the family lines up single file. what is the probabillity that the mom is at the front of the line

There are 45 questions on your math exam. you answered 810 of them correctly. how many questions did you answer correctly?

The length of a rectangle plus its width is 24 cm. the area is 143 square cm. what are the length and width of the rectangle?