The amount of a sample remaining after t days is given by the equation p(t)=a(1/2)^(t/h), where a is the initial amount of the sample and h is the half-life, in days, of the substance. a sample contains 18% of its original amount of radon-222. the half-life of radon-222 is about 3.8 days. which is the best estimate for the age of the sample?

Sum is 17 and their difference is 3

Aretha wanted to gather data about the cost of local bowling leagues in her area. she plotted the data and determined that the average bowling league costs consist of a one-time registration fee and a monthly fee modeled by the equation y = 15x + 20. identify and interpret the y-intercept in this model. the y-intercept is 20. this is the cost per month. the y-intercept is 20. this is the cost of registration. the y-intercept is 15. this is the cost of registration. the y-intercept is 15. this is the cost per month.

Evaluate each expression. determine if the final simplified form of the expression is positive or negative -42 (-4)2 42