Due to continental drift, africa and south america are moving away from each other at a rate of 4 centimeters per year. the two coasts are currently separated by 5,000 km. assuming this drift rate is constant, how long ago were the coasts touching? give your answer in millions of years.

Two lines parallel to the same plane are parallel to eachother

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

These tables represent a quadratic function with a vertex at (0, -1). what is the average rate of change for the interval from x = 9 to x = 10?