A scientist wants to predict the number of nitrates in the river. Which sample is better for making this prediction? Sample A: A random sample of 5 gallons of water from one location in the river
Sample B: A random sample of 5 gallons of water from five different locations in the river

Which of the following statements is not true? a. parallel lines are lines in the same plane that never intersect. b. congruent figures have the same shape and same size angles and sides. c. similar figures must have the same shape and the same size. d. a rotation is when you turn a figure around a certain point.

Which conjunction is disjunction is equivalent to the given absolute value inequality? |x+2|< 18

If the ratio of sum of the first m and n terms of an ap is m2 : n2 , show that the ratio of its mth and nth terms is (2m − 1) : (2n − 1).