Which estimation technique will yield a solution that is closest to the actual product of (–21.06)(–30.45)?

Ann and betty together have $60 ann has $9 more than twice betty’s amount how much money dose each have

Answer asap ill give ! ’ a sample of radioactive material decays over time. the number of grams, y , of the material remaining x days after the sample is discovered is given by the equation y = 10(0.5)^x. what does the number 10 represents in the equation? a. the half-life of the radioactive material, in days b. the amount of the sample, in grams, that decays each day c. the time, in days, it will take for the samples to decay completely d. the size of the sample, in grams, at the time the material was discovered

How to write four times a number,minus 6,is equal to theee times the number+8 as an equqtion