How do you write seven billion five hundred million

Mary had at least an 80% on her test write an inequality to represent this situation

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.

One card is dealt from a 52 card deck. find the probability that the dealt card is a 4 or a black 7