Valiant, I honor you; but as you are ambitious, I’ll give you more challenging circle problems. To be a true knight, one must draw a circle with secants and tangents where the x calculates to the secret code 13. Find out who are the real Knights of the Round Table (that has Secants & Tangents!).

The students at jefferson middle school are raising money for a charity by selling t-shirts and hats. the number of t-shirts sold was 3 times the number of hats. the profit was $5 for each t-shirt sold and $2.50 for each hat sold. the students raised $840 for the charity. they used the system below to analyze their success and found the solution to be (144, 48). 5x+2.50y=840 x=3y how much did they earn from t-shirt sales?