Stanley noticed that he is both the 10th tallest and the 10th shortest student in his class. if everyone in the class is at a different height, how many students are in the class?
a. 19
b. 20
c. 21
d. 22

irrational, cannot

hi there!

first we need to find out how much they are adding to each number to make the next number.

ex: 4 + 4 = 8, 8 + 8 = 16, and so on.

so continuing with 32,

32 + 32 = 64

64 + 64 = 128

128 + 128 = 256

256 + 256 = 512

4, 8, 16, 32, 64, 128, 256, 512

the 8th term of the sequence will be 512

hope this ! ~