Asound wave travels through iron at a rate of at what rate does the sound wave travel in

What is the value of the discriminant of the quadratic equation -2x = -8x + 8 and what does its value mean about thenumber of real number solutions the equation has?

Mr.walker is looking at the fundraiser totals for the last five years , how does the mean of the totals compare to the median?

In a timed typing test lara typed 63 words per minute.estimate the number of words she should be able to type in half in hour show your work