18. Find the measure of each numbered angle.
m∠1 = 50°, m∠2 = 90°, m∠3 = 40°, and m∠4 = 50°
m∠1 = 50°, m∠2 = 90°, m∠3 = 30°, and m∠4 = 50°
m∠1 = 70°, m∠2 = 130°, m∠3 = 20°, and m∠4 = 70°
m∠1 = 60°, m∠2 = 90°, m∠3 = 30°, and m∠4 = 60°

m∠1 = 50°, m∠2 = 90°, m∠3 = 40°, and m∠4 = 50°

Step-by-step explanation:

Angles on straight line are equal;

Vertical angles are equal,

Complementary angles add up to 90°.

Angles on straight line adds up to 180°

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

cut 138 centimeters off

step-by-step explanation:

250-112 = 138