Answer:
4
Step-by-step explanation:
a triangle has angles that add up to 180°
an equilateral triangle has equal angles
so each angle is 60° (because 180/3 is 60)
so 10x +20 = 60
10x = 40
x = 4
Answer:
y = 12x + 10
Step-by-step explanation:
Answer:
26 teaspoons
Step-by-step explanation:
15+20=35
6+20=26
Answer:
42 degrees & 138 degrees.
Step-by-step explanation:
By definition, "SUPPLEMENTARY ANGLES ADD UP TO 180 DEGREES."
That being said you can solve for the missing angle (or really just subtract 138 from 180).
180-138 = 42
(-1/2) and (-3/4)... multiply numerators and denominators and you will get 3/8