Atrain traveled at an average speed of 45 miles per hour for 2 hours and 30 miles per hour for 3 hours. what is the total number of miles that the train traveled

Can someone me with this problem i don't understand i need

Li buys supplies so he can make and sell key chains. he begins to make a profit only after he sells 4 key chains. what point on the graph makes the most sense in this situation?

What is x and y intercepts for y=x+7