One sample has n = 5 scores and the second has n = 10 scores. if the pooled variance for the two sample is 30, then what is the value of the estimated standard error for the sample mean difference?

The value of the estimated standard error for the sample mean difference is 5.4494897 or approximately 5.45. The formula to get the value of the estimated standard error for the sample mean difference is the square root of (30/5) + (30.10) = 5.45
The answer in this question is 5.45

The total would be 40.53