The missing angles

* There’s really no question just this picture* I’m in need of help

4. find the geometric mean of 4 and 12. 24 8

Cassie is traveling 675 miles today to visit her brother and his family. so far, she has stopped for gas three times. at the first stop, she put in 7.1 gallons of gas and paid $23.79. at her second stop, she put in 5.8 gallons of gas and paid $19.08. and, at the third stop, 6.6 gallons and paid $20.39. at which stop did casey pay the most for gas?

If tan2a=cot(a+60), find the value of a, where 2a is an acute angle