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Answer:
d
Step-by-step explanation:
4 Hours because 50 times 4 is 200 and 200+75 is 275
100% - 65% = 35% of students DO NOT participate
980 * 35/100 = 980 * 0.35 = 343 students don't participate
z° is 26°.
As the angles are complementary, as stated in your problem: