Question

If a/4 = 9/a, then...?

1. a²=36
2. 4a = 9a
3. a + 4 = 9 + a
4. a - 4 = 9 - a

Answer 1

Cross multiply.
\(\large\frac{a}{4}=\frac{9}{a}\rightarrow aa = 4(9)\rightarrow ??\)

Answer 2

Thanks.