Answer:
1
Step-by-step explanation:
you simply divide 154 by 9, get around 17.1. 17 is the closest whole number answer, so 17*9 is 153.
do 154-153, you get 1.
not the best explaination but i hope it helps.
Answer:

Step-by-step explanation:
we know that
The formula to find the sum is equal to

where
a1 is the first term
an is the last term
n is the number of terms
In this problem we have



substitute the values in the formula

Well, the interseciton of 2 planes would be a line, so it would be like line AB when it goes through the 2 points A and B
S = 4pi r^2
S/4pi = r^2
taking square root on both sides,
r = sqrt (S/4pi)