4. (a) Find, in terms of n,
r=1(4r + 3).
(b) Hence, or otherwise,
evaluate 44921( 4r + 3).
Given that r=1( 4r + 3) = 525,
(c) Find the value ofn,
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Let the at A be x k
and the B be y k
when the is x−y
Dist=100km
⟾ =5 hours
∴ Dist =S×T
⟾ 100=(x−y)5
⟾ x−y=20⟶(I)
when THE is x+y
⟾ Dist=100km
⟾ t=1 hours
⟾ Dist=ST
⟾ 100=(x+y)1
⟾ x+y=100⟶(II)
Solving (I) & (II)
⟾ x−y=20
⟾ x+y=100
⟾ 2x=120
⟾ x=60km/h
⟾ y=40km/h
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