Is -7 +4 equivalent to 4 + (-7) show the sum for each expression on a number line to justify your answer

You receive 15% of the profit from a car wash how much money do you receive from a profit of 300

What is the lcm of 16 and 40 ? 24 and 40 ?

There are three bags: a (contains 2 white and 4 red balls), b (8 white, 4 red) and c (1 white 3 red). you select one ball at random from each bag, observe that exactly two are white, but forget which ball came from which bag. what is the probability that you selected a white ball from bag a?