Find the linearization of the function f(x, y)=√(129−3x^2−2y^2) at the point (5, -5). L(x, y)= ?

Use the linear approximation to estimate the value of f(4.9,−4.9) = ?

I'm being volume of cylinder with 13 in. radius and 30 in height answer choices in pic

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 the ratio of sum of the first m and n terms of an ap is m2 : n2 , show that the ratio of its mth and nth terms is (2m − 1) : (2n − 1).