Akite has an area of 40 square units and a diagonal of 10 units. what is the length of the second diagonal a. 20 units b. 8 units c. 16 units d. 4 units

Which of these equations, when solved, gives a different value of x than the other three? a9.1 = -0.2x + 10 b10 = 9.1 + 0.2x c10 – 0.2x = 9.1 d9.1 – 10 = 0.2x

Cos^2x+cos^2(120°+x)+cos^2(120°-x)i need this asap. pls me

Can someone me with this? i’m not sure what to put for my equations.