12ax^{2} -15ab-16a+20b[/tex]
1 answer:
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A_{1} = 4
a_{2} = 12
a_{2} = a_{1}*q
12 = 4q
q = 3
S20 = a_{1}*
S20 = 4*
S20 = 4*
S20 = 2*3486784400
S20 = 6,973,568,800
a_{2} = 12
a_{2} = a_{1}*q
12 = 4q
q = 3
S20 = a_{1}*
S20 = 4*
S20 = 4*
S20 = 2*3486784400
S20 = 6,973,568,800