What is the equation of a circle with center (5, -7) and Circumference = 12

Answer this question only if you know the answer! 30 points and

Two blends of tea are mixed to make a blend that will be sold at the fair. black tea sells for $2.20 per pound and orange pekoe tea sells for $3.00 per pound. how much of each should be used to obtain a 4lb blend selling for $2.50 per pound?

Yo y do yall have 2 stars that means yall wrong bro