Jon buys fencing for his yard. He pays $122 for 5 fence posts and 4 fence panels. He pays $570 for 21 fence posts and 20 fence panels. How much does he pay for 4 fence posts and 3 fence panels? Show how you figured it out.

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