Assuming 0.4 is in fact, 2 divided by 5 (and not an approximation of some number that would require an infinite amount of decimal places to exactly express), then multiplication by 0.4 is the same as multiplying by 2 and dividing by 5.
This means that multiplying any rational number by 2/5 will yield another rational number (as given x/y as an input, where x and y are integers, and multiplying it by 2/5 giving 2x/5y, will mean that 2x and 5y are also integers, and the result is also rational)
If we multiply an irrational number by 2/5, however, the result will be irrational.
So your answer is any number not in the set of rational numbers, multiplied by 0.4, will yield an irrational number.
add me on disc its not letting me explain what i wanted to explain its Andrew#6506
3/5
3x20/5x20
60/100
60x20/100x20
1200/2000
1200 doctors use brand x
14 miles.....16hours
xmiles.......1hour
14x1=14
14/16=0,88 miles
Answer: It's 3.8
Step-by-step explanation:
