One sample has n=4 and a second sample has n=8. If the pooled variance for the two samples is 24, then what is the estimated standard error for the sample mean difference?

Aclothing store has the sign shown in the shop window. pani sees the sign and wants to buy 3 shirts and 2 pairs of jeans. the cost of each shirt before the discount is $12, and the cost of each pair of jeans is $19 before the discount. write and simplify an expression to find the amount pani pays if a $3 discount is applied to her total