The number a is a number less than -3. What is the range of possibl values of 1/a^2 ?

Question

a. 1/a^2 <-9
b. 1/a^2 <-3
c. -1/9<1/a^2<1/9
d. 0<1/a^2<1/9
e. 1/9<1/a^2<1/3

please answer and explain

Answer 1

a < -3
a^2 > 9
1/a^2 < 1/9

a^2 is always positive, and 1/a^2 cannot be zero,

(d)