Answer:
b
Step-by-step explanation:
Answer:
{2/3 ; -1}
Step-by-step explanation:
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{c, d, e} is common to both sets A and C.
{c, d, e} is called "the intersection of A and C."
Look up "intersection (set theory)" on the 'Net, for more info.
When you add the degrees of all the angles in a triangle you should get 180
A= 5x+5
B= 90
C= 3x+5
5x + 3x = 8x
5 + 90 + 5 = 100
8x + 100 = 180 this is the equation
-100 -100
————————
8x = 80 ➡️ divide BOTH sides by 8
x = 10
Now plug 10 into angles A and C
5(10)+5= 55
3(10)+5= 35
A= 55 , B= 90 , C=35
