Answer:
A is 9 B is 35 and C is 400
Step-by-step explanation:
No real way to solve it, with the knoledge of the perfect squares (1,4,9,16,25,49 ect) you can do the simple ones but more complicated ones require a calculator to solve it in decimal form
There are multiple ways to do this.
The easiest is to just continuously subtract 7 from 65 the numbers of times needed.
But most math teachers will have you use the equation ar^n-1 where a= the first term (65), r=ratio (-7), and n=the term you need (second, fifth, and ninth).
So to solve you just plug your values in as so
AR^n-1
(65)(-7)^2-1(65)(-7)^5-1
(65)(-7)^9-1
if you make a graph and add the coordinates on the graph you can use that find out how it creates a ratio of 1:2
Answer:
C
Step-by-step explanation: