We see on the picture that :
When we go down one row, we add one horizontal and two diagonal cards.
In the first row we have 2 cards
In the second 2+3=5 cards
In the third 5+3=8 cards
etc.
General formula : in the n-th row from the top, we have
Answer:
4
Step-by-step explanation:
I believe but i also got 3.6
Let denote the -th term of the sequence, starting with the index . Denote by the forward differences of , that is
for . We have
which indicates is an arithmetic sequence with common difference between terms of 3 and starting with 4, so that
for . So we have
and so on, with the th term given by
Reversing the order of all but the first term in the sum gives
so that
for .
Your friend is taller because 1 5/8 in. is rounded to about 2 in. and 5.6 ft. is taller than 5.2 ft.