Answer:
a.
2x+4x+3x=180 sum of interior angle of the triangle is 180
9x=180
x=180/9=20
b.
x-20+x+10+x-20=180sum of interior angle of the triangle is 180
3x-30=180
3x=180+30
x=210/3=70
c.x+10+x+20+x=180 linear pair
3x+30=180
3x=180-30
x=150/3=50
Because all the angles are congruent (the same), this is an equilateral triangle. All equilateral triangles have congruent angles and congruent sides, so all sides has to be 14.
Answer:
11.2 gallons
Step-by-step explanation:
by multiplying 16 by 0.965 (as it is a 4.5% decrease per year) and then multiplying the answer by 0.965 and so on until done a total of 10 times gets you the answer 11.2 gallons. there is a quicker way to do it but I cannot remember sorry