If a radioactive element has a half-life of 40 minutes. initial count rate was 1000 per minute, then how long will it take for count rate to drop to 125 per minutes?

On new year's day, the average temperature of a city is 5.7 degrees celsius. but for new year's day 2012, the temperature was 9.8 degrees below the average. i) if a represents the average temperature on new year's day and 7 represents the temperature on new year's day 2012, what formula accurately relates the two values together? ii) what was the temperature on new year's day 2012? dt a 0.8 ii) - 4 1 degrees celsius da-t-98 ii) 59 degrees celsius 1) 7 = -9,8 11) 59 degrees celsius ii) l degrees celsius

Which of the following graphs could represent a cubic function?

Math i have no idea how to do a and b