21 years ago Alvin was 11 times older than Tomio. The sum of their present age is 54.

Find the constant of variation for the relation and use it to write an equation for the statement. then solve the equation.

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

You buy a veido game for $60 and the sales tax is 8% what is the total cost for the game including the sales tax