Answer:
0
Step-by-step explanation:
substitute 1 for v
2(1)^3 - 1^2 + 3(1) - 4
2 - 1 + 3 - 4
1 + -1
0
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.
5y-4=9y+8
Subtract 5y from both sides
-4=4y+8
Subtract 8 from both sides
-12=4y
Divide both sides by 4
-3=y
Check by plugging it in:
5(-3)-4=9(-3)+8
-15-4=-27+8
-19=-19
True
Final answer: y=-3
It would be 4 952 700. i hope this hellps