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What describes horizontal cross section of the right rectangle 6m 8m 5m

Jason went to an arcade to play video games. he paid $2 for every 11 tokens he bought. he spent a total of $16 on tokens. which equation can be used to determine,t, the number lf tokens jason bought

In the diagram, ab is tangent to c, ab = 4 inches, and ad = 2 inches. find the radius of the circle.