write the standard form equation of an ellipse with a center at (1,2) vertex at (7,2) and focus at (4,2)

If the measure of xyz is 81 what is the measure of yz

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?

The ph level of a blueberry is 3.1 what is the hydrogen-ion concentration [h+] for the blueberry