Historians include thesis statements in their essays in order to: a. make sure readers understand their key claims. b. refute any counterclaims a reader might try to make. c. avoid being accused of plagiarizing other content. d. reduce the number of body paragraphs in the essay

the sum of all the angles in a triangle are equal to 180

so you can add   the 3 given angles together to equal 180:

5y + 2y + 2y = 180

or since all three angles have the same letter, combine the 3 angles to equal 180:

9y = 180

typically if you want , you would actually put questions here for us to you. but hey, that's just me. maybe someone will magically answer the questions for you without knowing what they are.

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relating to or denoting a system of numbers and arithmetic based on the number ten, tenth parts, and powers of ten.

step-by-step explanation: