4d+15 is equal to or greater than - 1

solution: d is greater than or equal to - 4

interval notation: ( - infinity, - 4)

Step-by-step explanation:

4d+15 - 15 greater than or equal to - 1 - 15

4d greater than or equal to - 16

4d over 4 greater than or equal to - 16 over 4

d greater than or equal to - 4