Can I use score in another command. 
Real Example: 
   execute if score @p worldBorder < @p advCount run worldborder set advCount
I have no idea how to pull in the value for advCount
Full Code (so far):
#Set up scoreboards
#deathCount takes care of incrementing everything so no more is needed here. 
scoreboard objectives add Deaths deathCount 
#scoreboard objectives setdisplay sidebar Deaths
scoreboard objectives add advancements dummy
#scoreboard objectives setdisplay list Deaths
#temp scoreboard to hold the count of advancments 
scoreboard objectives add advCount dummy
#scoreboard objectives setdisplay sidebar advCount
scoreboard players set @p advCount 0
execute if entity @p[advancements={adventure/kill_a_mob=true}] run scoreboard players add @p advCount 10
execute if entity @p[advancements={adventure/sleep_in_bed=true}] run scoreboard players add @p advCount 10 
execute if entity @p[advancements={adventure/root=true}] run scoreboard players add @p advCount 10
... yup more to do
#Deaths now needs a scoreboard to be multiplied by... 
scoreboard objectives add deathPenalty dummy
scoreboard players set @p deathPenalty 5
scoreboard players operation @p deathPenalty *= @p Deaths
#final world boarder
scoreboard players operation @p advCount -= @p deathPenalty
#store the worldborder into a new scoreboard
scoreboard objectives add worldBorder dummy
execute store result score @a worldBorder run worldborder get
#run the worldborder update here 
execute if score @p worldBorder < @p advCount run worldborder set advCount **#<--- no idea what to do here... **
#then delete the scoreboard
#scoreboard objectives remove advCount
#scoreboard objectives remove worldBorder
#scoreboard objectives remove deathPenalty