2 Calculate the volume (in milliliters (mL)) of 1.15 M potassium sulfate, K2SO4, solution that can be produced
preparing 75.0-grams of K2SO4.

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 .

The answer is solid copper 

Aquantity of that isotope to decay to 1/2 of  its original value

Tell me the answer choices and i would be able to answer. : )