# Sarah Akin

### Sarah's Recent Activity

Sarah provided a contribution 3 years ago

Question 2551 | Mathematics Past Questions

F = $$\cfrac{a}{1-r}$$, $$a=?, r=?$$
To find sum to infinity, $$a$$ and $$r$$ are required:
$$ar = -\frac{1}{2}$$...(1)
$$ar^2 = \frac{1}{4}$$...(2)
Divide equ 2 by 1:
$$\cfrac{ar^2}{ar} = \cfrac{\frac{1}{4}}{-\frac{1}{2}}$$
$$r = -\frac{1}{2}$$
Then input the value of $$r$$ in one of the equ $$a = 1$$:
This gives us: $$\frac{1}{1-\frac{1}{2}} = \frac{2}{3}$$

Sarah provided a contribution 3 years ago

Question 2545 | Mathematics Past Questions

Sorry i mean after converting the two bases to base ten then u convert ur answer to base i.e 36 base ten = 210 base four

Sarah provided a contribution 3 years ago

Question 2545 | Mathematics Past Questions

Convert base 4 and base 2 to base 10 then convert to ten back