lololol270
05.02.2020 •
Mathematics
Asecurity code consists of 2 digits (0-9) and a digit can be used more than once.how many possible security codes are there
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Ответ:
Ответ:
Step-by-step explanation:
(2x + y) + (3x - y) = 180° {straight line}
2x + y +3x - y = 180
2x + 3x + y -y =180
5x +0 = 180
5x = 180
x = 180/5
x = 36
5y = 3x - y {Vertically opposite angles are equal}
5y = 3*36 - y
5y = 108 - y
5y + y =108
6y = 108
y =108/6
y = 18