Notice this is a geometric progression since each number multiplied by some factor equals the next number in the sequence, in this case,

Then by applying the formula for sum to infinity of a geometric progression,
Answer:
charlie,brian,abel
Step-by-step explanation:
Answer:
x=45
Step-by-step explanation:
180-90=90÷2=45
11.4 should be the answer
if you mean tens then it is 10
Answer:
x=3
Step-by-step explanation: