Write the rule for the nth term of the geometric sequence. then find a5
a2= 20 , r= 1/4

aₙ = a₁rⁿ⁻¹

a₅  = 5/16

Step-by-step explanation:

Formula:

nth  term of geometric sequence

aₙ = a₁rⁿ⁻¹

aₙ - nth term

a₁ - first term

r - common ratio

To find a₅

It is given that, a2= 20 , r= 1/4

we can find a₁

a₁ = a₂/r = 20/(1/4) = 20 * 4 = 80

aₙ = a₁rⁿ⁻¹

a₅ = a₁r⁽⁵⁻¹⁾ = 80 * (1/4)⁴ = 5/16

Therefore a₅  = 5/16

the answer would be d

straight away you can eliminate a and c because not all books contain a scientific skill because some may be fiction. c is also wrong because it saids that the only way children can learn is through books which is incorrect.

b is also wrong because reading can be a scientific skill but not always, therefore it is wrong which leaves you with d, the correct answer since it said that it can children learn.

hope this ! : 3

the answer is -1 1/5, also a

hope i

-lavira : )