Question

(y-20°) +(y+30°)

1y-20° 1y+30°=90 30-20=10
2y+10=90 2y=90-10=80
y=80/2=40 y=40
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y-20=40-20=20
y+30=40+30 =70
70+20=90//
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Answer 1

Mathematics includes the study of such topics as quantity, structure, space, and change. It has no generally accepted definition. Mathematicians seek and use patterns to formulate new conjectures; they resolve the truth or falsity of such by mathematical proof.