Scientists at the Hopkins Memorial Forest in Western Massachusetts have been collecting meteorological and environmental data in the forest for more than 100 years. In the past few years, sulfate content in water samples from Birch Brook has averaged 7.5 mg/L with a standard deviation of 1.5 mg/L. (a) What is the standard error of the sulfate in a collection of 15 water samples

Polygons efgh and e′f′g′h′ are shown on the coordinate grid: what set of transformations is performed on efgh to form e′f′g′h′? a. a translation 1 unit to the left followed by a 90-degree counterclockwise rotation about the origin b. a translation 1 unit to the right followed by a 90-degree counterclockwise rotation about the origin c. a 90-degree clockwise rotation about the origin followed by a translation 2 units to the right d. a 90-degree clockwise rotation about the origin followed by a translation 2 units to the left

Which property was used to simplify the expression? 3c+9 +4c=3c+4c+9

Given the numbers c = –3 and d = 4, which statement is true? a. |–c| = 3 and |–d| = –4 b. |–c| = 3 and –|d| = –4 c. –|c| = –4 and –|d| = 3 d. |–c| = 3 and –|d| = 4