The least-squares regression model yˆ=−3.4+5.2x and correlation coefficient r=0.66 were calculated for a set of bivariate data with variables x and y . Which of the following is closest to the proportion of the variation in y that cannot be explained by the explanatory variable?

How to solve a simultaneous equation involved with fractions?

Acircle has a radius of 5/6 units and is centered at (3.6, 7.8) write the equation of this circle

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