Round 145 to the nearest hundreds place.
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Alex drew a circle with right triangle prq inscribed in it, as shown below: the figure shows a circle with points p, q, and r on it forming an inscribed triangle. side pq is a chord through the center and angle r is a right angle. arc qr measures 80 degrees.

What is the name used to describe a graph where for some value of x, there exists 2 or more different values of y?

What is the number 321,000,000 in scientific notation? also what is the number? ?