Please help me please

Write numerical coefficient of y² in the expression 2x² - 15xy – 7y²

Asap describe the transformations required to obtain the graph of the function f(x) from the graph of the function g(x). f(x)=-5.8sin x. g(x)=sin x. a: vertical stretch by a factor of 5.8, reflection across y-axis. b: vertical stretch by a factor of 5.8,reflection across x-axis. c: horizontal stretch by a factor of 5.8, reflection across x-axis. d: horizontal stretch by a factor of 5.8 reflection across y-axis.

How many kilometers are equal to 5 miles? use 1 mile ≈ 1.61 kilometers. !