Twice a number decreased by 30 is 50. What is the number?
40

80

120

160

40

Step-by-step explanation:

2(x)-30=50

2(40)-30=50

80-30=50

50+50

linear pair postulates

the answer for this question is : 360°

step-by-step explanation:

we have been given a triangle   we need to tell which one of these is a triangle below to map onto itself.

360° rotation is the complete rotation which eventually leads to the same figure which is given.

the correct will be, that is 360° that will cause the triangle below to map onto itself.