maths help (1 Viewer)

[bananarama69]

a plant when first observed has a height of 420mm. In the first week it grows 10cm and each succeeding week its growth is found to be 70% of that of the previous week.
a) find the height of the plant to the nearest mm at the end of 8 weeks.
b) does the plant have a limiting sum? if so why and what is it?

bit of a brain buster:angry:

 

[shady145]

a plant when first observed has a height of 420mm. In the first week it grows 10cm and each succeeding week its growth is found to be 70% of that of the previous week.
a) find the height of the plant to the nearest mm at the end of 8 weeks.
b) does the plant have a limiting sum? if so why and what is it?

bit of a brain buster:angry:

nup

straight forward
u just plug info into the right equation

b) yes, ratio<1

 

[bananarama69]

so i just plug it into the limiting sum formula? a being 10 and r= 70%