In a lock there are ten numbers to choose from the set of (0, 1, ..., 9) and we choose 4 of them. How many ways are there to choose them? Please Explain. I forgot how to do these types of problems. Ty!

For the equations below which statement is true ?

What is the slope of the line shown below?

Look at the hyperbola graphed below. the hyperbola gets very close to the red lines on the graph, but it never touches them. which term describes each of the red lines? o o o o a. asymptote b. directrix c. focus d. axis