Question

Ellas _______ hambre si no comen ahora.

Answer 1

Is Tendrán, I'm Latino

Answer 2

Conjugation of  the word tener to the "ellas" form.. the word is 'tienen' in the present form.

Now.. a bit further. 

Preterit (Past)
'tuvieron'

Just a bit further.. 

Imperfect
'tenían'

A lil further..

Conditional
'tendrían'

Now we're in the future.. 'furtherness'

Future
tendrán

Boom! There it is. The word tener conjugated in the future tense the answer is 'tendrán'

The sentence reads..Ellas tendrán hambre si no comen ahora.

They will be hungry if they do not eat now.

I hope this helps!