12 grams(g) of a chemical are added to a metal. the amount a, in grams, of the chemical remaining during a reaction with a metal plate decreases by 0.5g per second. if instead the plate were dissolved, the amount a', in grams, of chemical remaining would decrease by half of itself every 4 seconds. how many grams greater is a than a' after 12 seconds?

Ageologist had two rocks on a scale that weighed 4.6 kilograms together.rock a was 0.5 of the total weight.how much did rock a weigh?

1- what do you think the product of a nonzero rational number and an irrational number is? is it rational or irrational? make use of variables, the closure property of integers, and possibly a proof by contradiction to prove your hypothesis.2- why do we have to specify that the rational number must be nonzero when we determine what the product of a nonzero rational number and an irrational number is? if the rational number were 0, would it give us the same result we found in the first question?

Eric drove 275 miles in 5 hours. at the same rate how long would it take him to drive 495 miles?