121°
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1089
100°
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102
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x = 109

Step-by-step explanation:

The formula for sum of angle in a polygon = (n - 2) * 180 where n is the number of sides of the polygon

The figure in the image is a pentagon meaning a polygon with five sides and as such n = 5

plugging n=5 in the above equation, we get the sum of angles in a polygon is;

(5-2)*180 = 3*180 = 540

=> x + 121 + 108 + 102 + 100 = 540

x = 540 - 121 - 108 - 102 - 100

x = 109

since the airplane is moving with constant speed then the distance travelled can be calculated by x=u*t

in km/h would be:

x=640*3.5=2.240 km

in m/s would be:

u=640 km/h= 640.000 m/h =640.000/ 3600 m/s =177.8 m/s

t= 3.5 h= 3.5 * 3600 s=12.600 s

then x=u*t= 177.8*12.600= 2.240.280 m

(x+3)(x+7)

step-by-step explanation: