<h3><em>
Answer: </em></h3><h3><em> I think the first answer is S(t) = 2^t - 1 .</em>
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13/52= 1/4 or .25
If you have a scientific calculator it really helps with simplifying numbers to the lowest term.
Bonjour, (as you write in roumain)
Soient a et b les 2 nombres
(a+b)/2=200==>a+b=400
8/a=4.5/b==>16b=9a
a+9a/16=400
==> 25a/16=400
==>a=400*16/25
==>a=256
et b= 9*256/16; b=144
Rafael walks 22.5 km in 9 days.
