Do u add or multiply during volume

What is the solution to the equation 9^(x+1) =27

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

Iwant to know what 3g+5h+4g-2h is my teacher is too selfish to tell us