How many mL of a 1.5M NaOH solution are required to make 250mL of a 0.10M NaOH solution?

I’m guessing you’re more alert to yourself or your surroundings if you’re more concentrated

Any photo? or something

Ithink is d. physical property

The independent variable is the type of music.the dependent variable is the pulse rate.the intervening variable is the age of the subject.if the mother does not like rock, her pulse is likely to not increase.the same might be true for the sister.the friend may like rap and gets excited.to establish cause/effect relationship, all of the subjects must be consistent.hope i .