What kind of angels is created by the intersection of two perpendicular lines rays or line segments

Aclass consists of 55% boys and 45% girls. it is observed that 25% of the class are boys and scored an a on the test, and 35% of the class are girls and scored an a on the test. if a student is chosen at random and is found to be a girl, the probability that the student scored an ais

How is working backward similar to solving an equation?

What is the best approximation for the area of a circle with a radius of 4 m ? use 3.14 to approximate pi