';my hair and nail growth (to have)'; How do I conjugate ';to have';. Has or have?

Is it plural (thus have) becasue of hair and nail? Or is it singular because of growth (and thus, has)?';my hair and nail growth (to have)'; How do I conjugate ';to have';. Has or have?
Definitely ';has';


See, in ';my hair and nail growth'; the thing your looking for, the subject of the sentence, is ';growth';, which would be much easier to see if you put it in a sentence, such as:


';My hair and nail growth (to have) become uncontrollable.';


Then you ask, ';What has become uncontrollable?'; and the answer is, growth. Growth of 2 things, yes, but ';growth'; itself is singular.


So, ';My hair and nail growth has...';';my hair and nail growth (to have)'; How do I conjugate ';to have';. Has or have?
my hair and nails have grown


Has my hair and nails grown this week?





the growth of my hair and nails seems to have stopped





Has the growth of my hair and nail stopped this week?
My hair and nail growth HAVE grown in the past week due to my using a good Vitamiin B use
My hair and nail growth have ...


Growth is the noun. Hair and nail are adjectives telling which growth.
My nails HAVE grown, my hair HAS grown.....or my hair and nails have grown
is it really bothering u that much, that has confused the hell outta me anyway卢