Use the geometric series formula to find the 9th term in this progression : 12 18 27...
Formula for nth term in a geometric progression = ar^n-1
workings:
a=12
r=1.5 because 18/12 = 1.5
Thus, using ar^n-1 --> 12 * 1.5^8 = 307.54... or 308 (to 3sf)
(In an ideal scenario question we'd be working with a whole number as the answer, but i created this question in about a minute so couldn't ensure the answer would be a whole number).
PF
Related Maths A Level answers
All answers ▸The curve C has the equation (x^2)+4xy-8(y^2)+27=0. Find dy/dx in terms of x and y.
How would you integrate ln(x) with respect to x?
Find the exact solution to the equation: ln(3x-7) =5
what is the equation of the normal line to the curve y=x^2-4x+3 at the point (5,8)?