S=a + (n-1) d, solve for d

Answer:/frac{s-a}{n-1}

Step-by-step explanation:

formula, s=a + (n-1) d

1. get rid of the a on d's side by subtracting it from both sides.

s=a + (n-1) d becomes s-a = (n-1) d

2. get rid of (n-1) by dividing it from both sides. s-a = (n-1) d becomes

/frac{s-a}{n-1} = d