Two resistors, each of 2ω, are in parallel with one another. if a two more 2ω resistors are added in parallel, how does the resistivity of the circuit change?

resistance will double
resistance will quadruple
resistance will reduce by ½
resistance will reduce by ¼

Could someone . i have tried to solve myself but my calculation is off

Calculate the ratio of h+ ions to oh– ions at a ph = 6. find the concentration of h+ ions to oh– ions listed in table b of your student guide. then divide the h+ concentration by the oh– concentration. record this calculated ratio in table a of your student guide. compare your approximated and calculated ratios of h+ ions to oh– ions at a ph = 6. are they the same? why or why not? record your explanation in table a. what is the concentration of h+ ions at a ph = 6? mol/l what is the concentration of oh– ions at a ph = 6? mol/l what is the ratio of h+ ions to oh– ions at a ph = 6? : 1

What is the measure of how much matter is in an object and that can be measured using a balance? a. height b. volume c. weight d. mass