teal5393
26.05.2020 •
Mathematics
2(x-1)+8=4x-20 find the solution
(15 points)
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Ответ:
13
Step-by-step explanation:
2(x-1)+8=4x-20
distribute 2
2x-2+8=4x-20
2x+6=4x-20
subtract 2x from both sides
6=2x-20
add 20 to both sides
26=2x
divide both sides by 2
x=13
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Ответ:
Step-by-step explanation:
3 and 4 are linear pair
∠ 3 + ∠4 = 180°
76 + ∠4 = 180°
∠4 = 180 - 76
∠4 = 104°