Answer:
d < -28
d ∈ (-∞ , -28)
Step-by-step explanation:
[tex]\frac{d}{7}[/tex] + 4 < 0
Taking 4 on the right side of the equation,
We get, [tex]\frac{d}{7}[/tex] < -4
Now, since 7 is positive number , we can transfer it to right side of the equation multiplying with -4,
It gives, d < -28.
So d belongs from -∞ to -28 excluding -28 ,
We can write, d ∈ (-∞ , -28).
