Answer:
6
Step-by-step explanation:
Begin by adding 4.9x to both sides.
1.3> 11.1 + 4.9x This way you never have to remember to turn the > into < when dividing by a minus.
Subtract 11.1 from both sides
-9.8 < 4.9x Divide by 4.9
-9.8 / 4.9 < x
-2 < x
4b - 7 + 2b + 11 and b + 3 + b + 1 are congruent.
You add the common factors in each problem: 2b + 4 = 2b + 4
Sum of the angles in a triangle ... 180!
Isosceles, two of them are equal: 100 + 2x =180, x = 40 degrees! <- That's the answer ;)