Answer:
x<1
Step-by-step explanation:
Le the unknown number be x;
Negative four times a number is expressed as -4x
Negative four times a number decreased by nine is expressed as -4x - 9
If this expression is greater than negative thirteen, then;
-4x - 9 > -13
-4x - 9+9 > -13+9
-4x > -4
x < -4/-4
x < 1
Hence the required solution is x<1
