HELP ASAP PLZ Given sinx = 2/3 and cos < 0 a) Use double identities to find the exact values of sin2x and cos2x

I got cos2x =1/9 and sin2x =

I'm just confused on how to do b & c.

b) Use a Pythagorean Identity to verify the answers you found for sin2x and cos2x.

c) Use a Ratio Identity to find tan2x. Do not use the double angel identity for tangent.

Which graph represents the given linear function 4x+2y=3

Hello, i need compare km^2 and km. what's difference in this?

The price for gasoline is represented by the equation y=3.69x, where y represents the total price for x gallons of gasoline. on a graph, the number of gallons is represented on the horizontal axis, and the total price is represented on the vertical axis. determine whether each statement describes the graph of the equation. select true or false for each statement