I need help asapo

Evaluate the dot product of (3,-1) and (1,5)

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

Find the slope and the y-intercept if there's one and the equation of the line given these two points( 3, 2) and( 3, -4)