Answer:
Step-by-step explanation:
Check the attached diagram... since they are parallel lines, those angles should be equal. now as per the theorem of opposite angles, (3x + 10)° should be equal to 70° .
(3x + 10)° = 70°
3x = 60°
x = 20
Well 75x12=900 so 900 divided by 40 is 22.5 so 22 teachers can have 40 chalks but the principal needs to order another 20 :)
2*1.4=2.8
1.5*1.4= 2.1
New figure: 2.8 by 2.1
1/2.h.(b1 +b2)which would mean 1/2x5.5x(7+11)