A jar contains 3 red marbles numbered 1 to 3 and 4 blue marbles numbered 1 to 4. A marble is drawn at random from the jar. Find the probability that the marble is red or even-numbered. help please

Suppose a pendulum is l meters long. the time,t,in seconds that it tales to swing back and forth once is given by t=2.01

Scores on a university exam are normally distributed with a mean of 78 and a standard deviation of 8. the professor teaching the class declares that a score of 70 or higher is required for a grade of at least “c.” using the 68-95-99.7 rule, what percentage of students failed to earn a grade of at least “c”?

How many solutions does the nonlinear system of equations graphed below have? a. one b. zero c. four d. two