Question

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,​

Answer 1

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