is my answer correct?

Question

find the magnitude of the resultant of two vectors u and v given that

u = 2 and v = 7 and the angle between the vectors when they are arranged tail to tail is 25.

round your answers to two decimal places

i did it and got 1.42 as the answer.

Answer 1

Let c be the magnitude of the resultant vector

By the Law of Cosines, c² = 2² + 7² - 2(2)(7)cos25°

Solve for c