shikiaanthony
16.12.2020 •
Mathematics
NEED HELP ASAP PLEASE HELP ME
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Answers on questions: Mathematics
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Ответ:
m∠A = 40°
m∠B = 70°
Step-by-step explanation:
The sum of angles in a triangle is 180°.
x + 49 + x + 79 + 70 = 180
2x + 198 = 180
2x = 180 - 198
= -18
x = -18 ÷ 2
x = -9
m∠A = x + 49
= (-9) + 49
m∠A = 40°
m∠B = x + 79
= (-9) + 79
m∠B = 70°
Ответ:
Adult tickets= 390
Student ticket= 410
Step-by-step explanation:
4A + 2.5S= 2585
A+ S = 800
A= 800-S
Substitute into the first equation