Simplify (12x^3-8x^2)-(3x^3+9x^2+x-7)

What is the size of the matrix resulting from

What expression is equivalent to 1/2(2+3x-6)

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