You have 20 grams of phosphorus-32 that decays at a rate of 5% per day. how
long will it take for half of the original amount to decay?

i think you use the exponential decay formula to solve this (y = a (1 - r)^t), but i am not completely sure.

What is the range for 31,39,29,34,37,24,36,33,34,28

How many sides does a regular polygon have if each exterior angle measure is 45 degrees explain your answer, i really don't understand this.

Worth 100 points need the answers asap first row -x^2 2x^2 (x/2)^2 x^2 x is less than 2 x is greater than 2 x is less than or equal to 2 x is greater than or equal to 2 second row -5 -5/2 4 5 •2 is less than x& x is less than 4 •2 is less than or equal to x & x is less than or equal to 4 •2 is less than or equal to x& x is less than 4 •2 is less than x& x is less than or equal to 4