Aseventh grade student chooses a random sample of 50 out of 400 students. he finds that 7 students have traveled outside the united states. the students claims that over 50 of the students have likely traveled outside the united states. is the student correct? explain.

10 ! a train starts from grand city and travels toward belleville 388 miles away. at the same time, a train starts from belleville and runs at the rate of 47 miles per hour toward grand city. they pass each other 4 hours later. find the rate of the train from grand city.

Determine domain and range, largest open interval, and intervals which function is continuous.

What is the value of x in the equation7x+2y=48 when y=3