Which of the following expressions is equal to cos125°?
-cos55°
cos55°
cos(-55)°

  -cos(55°)

Step-by-step explanation:

The reference angle for second-quadrant angle 125° is (180-125)° = 55°. The cosine is negative in the second quadrant, so the equivalent expression is ...

  cos(125°) = -cos(55°)

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Your calculator (in degrees mode) can help you sort this out.

let's solve your equation step-by-step.

24−3x=−27

step 1: simplify both sides of the equation.

24−3x=−27

24+−3x=−27

−3x+24=−27

step 2: subtract 24 from both sides.

−3x+24−24=−27−24

−3x=−51

step 3: divide both sides by -3.

−3x

−3

=

−51

−3

x=17

answer:

x=17

step-by-step explanation:

mark brainliest and have a great day!