What are the vertex and x-intercept of the graph of the function below?

y=x^2-6x-7

Acabinmaker buys 3.5 liters of oat varnish the varnish cost $4.95 per liter what is the total cost of 3.5 liters

If you have 12 feet of string and you cut it into equal length of 5 inches each how much string will be left

The sum of the speeds of two trains is 720.2 mph. if the speed of the first train is 7.8 mph faster than the second train, find the speeds of each.