Solve for x.

Please I need help

-11 is your answer.

Step-by-step explanation:

Total measurements of interior angles in a triangle = 180°.

Note that the red square located on the bottom right angle signifies that it is a right angle, with a measurement of 90°. Set the equation:

Total measurement = (90) + (70) + (x + 31)

180 = x + (90 + 70 + 31)

180 = x + 191

Isolate the variable, x. Note the equal sign, what you do to one side, you do to the other. Subtract 191 from both sides:

180 (-191) = x + 191 (-191)

180 - 191 = x

x = - 11

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the answer is a

step-by-step explanation:

because your just changing the position of where the shape is

a. she will receive a refund of $278.

step-by-step explanation: