What is a simpler form of each product ? (8m+1)^2

Which equation represents the partial sum of the geometric series?

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

Solve the equation.then check your solution 8=1.88+a