Iam assuming 3 is part of the question, whenever a number is next to parenthesis it means to multiple, but we do the parenthesis first, so it would be -10 in the parenthesis then you times that by 3, which would be -30.
Another question on Mathematics
Mathematics, 21.06.2019 19:30
Select the margin of error that corresponds to the sample mean that corresponds to each population: a population mean of 360, a standard deviation of 4, and a margin of error of 2.5%