Pls help, don’t quite understand these at all and need the correct answers:)

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  cos(A) ≈ 0.9165

Step-by-step explanation:

Put the given value into the given relation and solve for the unknown.

  sin²(A) +cos²(A) = 1

  (2/5)² + cos²(A) = 1

  cos²(A) = 1 -4/25 = 21/25 . . . . . subtract (2/5)²

  cos(A) = √(21/25) ≈ 0.9165 . . . . . take the square root

Both sine and cosine are positive in Quadrant I, so we're only interested in the positive square root.

let y equal to

the total fare and x is the mile of taxi ride. so the equation is

y = 0.55x + 1.75

since susie has

$10 to spend for a taxi cab, so he can have

10 = 0.55x +

1.75

x = 15 miles of

taxi ride

so the system of

inequality is

10 < 0.55x +

1.75

x > 2

look at photo