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.
I think this is the answer if you follow the order of operations. X=12
<em>Hope it helps and is useful :)</em>
Answer:
<u>108 m²</u>
Step-by-step explanation:
Area of the figure :
- 3 x 6 + (3 + 3) x 6 + (3 + 3 + 3) x 6
- 6 (3 + 6 + 9)
- 6 (18)
- <u>108 m²</u>
