Answer:
summation
Step-by-step explanation:
This symbol is the summation symbol
It means to sum what comes after it
Answer:
x = 9
Step-by-step explanation:
20x + 20 = 200
-20 -20
20x. = 180
x = 9
Answer:
a
Step-by-step explanation:
Answer:
Hi I only know part be yes the figures are congruent
Step-by-step explanation:
There the same shape, same size so yes they are congruent