Which formula can be used to describe the sequence? -3, 3/5, -3/25, 3/125, -3/625 a. f(x) = -3(1/5)^x-1 b. f(x) = -3(1/5)^x-1 c. f(x) = -1/5(3)^x-1 d. f(x) = -1/5(-3)^x-1

Aball is thrown from a height of 139 feet with an initial downward velocity of 15 ft/s. the ball's height h (in feet) after t seconds is given by the following. h=139-15t-16t^2 how long after the ball is thrown does it hit the ground? round your answer(s) to the nearest hundredth. (if there is more than one answer, use the "or" button.) t =

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

Whit h equation best represents this situation the number 98 increased by an unknown number equal to 120