AB is tangent to circle O at B. Find the length of the radius r, if AB = 13 inch and AD = 6 inch

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Someone answer asap for ! the following statements are true about the coins calvin and sasha have collected. * calvin and sasha has the same amount of money. * calvin has only quarters. * sasha has dimes, nickels, and pennies * calvin has the same number of quarters as sasha has dimes. * sasha has $1.95 in coins that are not dimes. exactly how many quarters does calvin have?

Solve 17= -13 - 8x and show your work.