B. 40
Explanation:
40+10= 50, 2x40= 80, 50
50+50+80= 180
(180 degrees in a triangle)
Do we have a model, or anything to go by?
Answer:
The heat death of the universe which is also known as the big chill or big freeze is a conjecture in the ultimate fate of the universe which suggests that the universe would evolve to a state of no thermodynamic free energy and therefore would be unable to sustain processes that increase entropy
Answer:
Equation: 
x = -10 or x = 7
x = 7 (width can't be negative)
x + 3 = 10
Step-by-step explanation:
Represent the width of the rectangle by x. "The length of a rectangle EXCEEDS the width by 3" means the length is 3 LONGER than the width, so the length is represented by the expression x + 3.
Area = (length)(width)
70 = (x + 3)x
Multiply out the right side.

Factor the left side.

Each binomial could equal 0, so

The negative solution does not make sense as the width of a rectangle.
x = 7, making the length, x + 3 = 10
Answer:
13.6
Step-by-step explanation:
5 divided into 68 is basically the same thing as 68 divided by 5.
68/5 is equal to 13.6