Alexa's hair grows with an average speed of 3.5 × 10–9 m/s. how long does it take her hair to grow 0.30 m? note: 1 yr = 3.156 × 107 s.

we are given

speed  of 3.5 × 10^–9 m/s

Let's assume speed of hair is v

so,

now, we are given

her hair to grow 0.30 m

so,

we have to find time (t)

so, we can use formula

we can plug values

and we get

now, we can simplify it

now, we know that

we can find for 1s

we can replace 1s

we get

now, we can simplify it

and we get

..............Answer