A sum of money was invested at 3% p. a. simple interest over 4 years. The investment earned $384 in interest. Determine the principal invested.

3. solve the given inequality and graph the solution on a number line.

Exclude leap years from the following calculations. (a) compute the probability that a randomly selected person does not have a birthday on october 4. (type an integer or a decimal rounded to three decimal places as needed.) (b) compute the probability that a randomly selected person does not have a birthday on the 1st day of a month. (type an integer or a decimal rounded to three decimal places as needed.) (c) compute the probability that a randomly selected person does not have a birthday on the 30th day of a month. (type an integer or a decimal rounded to three decimal places as needed.) (d) compute the probability that a randomly selected person was not born in january. (type an integer or a decimal rounded to three decimal places as needed.)

You work in a hospital that has 9 floors. you need to see 3 patients on each floor. how many patients do you need to see in all?