What is the x-intercept of the graph below?

Select all the correct answers. what is 221,000,000,000,000,000,000 expressed in scientific notation?

Which shows the correct solution of the equation 1/2a+2/3b=50, when b=30?

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