4 x² - 8 x +6x² + 5 x -3 x²+7x​4 x² - 8 x +6x² + 5 x -3 x²+7x​4 x² - 8 x +6x² + 5 x -3 x²+7x​4 x² - 8 x +6x² + 5 x -3 x²+7x​4 x² - 8 x +6x² + 5 x -3 x²+7x​

Sanya noticed that the temperature was falling at a steady rate of 1.4 degrees every hour from the time that she first checked her outdoor thermometer. by 6 a. m., the temperature had fallen 21 degrees. which expression can you use to find how many hours earlier she had first checked the thermometer?

Acar started driving from city a to city b, distance between which is 620 miles, at a rate of 60 mph. two hours later a truck left city b and started moving towards city a at a rate of 40 mph. what distance from city a is the point where the truck and the car will meet?

Aculture started with 4,000 bacteria. after 5 hours, it grew to 5,200 bacteria. predict how many bacteria will be present after 19 hours. round your answer to the nearest whole number.