A teacher initially plans to take an SRS of size 50 from his large high school and calculate the sample mean of student GPAs. Later, the teacher decides to increase the sample size so that the standard deviation of the sampling distribution of will be half as big as when using a sample size of 50. What sample size should the teacher use? 57 100 150 200 354

Amodel rocket is launched from a roof into a large field. the path of the rocket can be modeled by the equation y = -0.04x^2 + 8.6x + 4.8, where x is the horizontal distance, in meters, from the starting point on the roof and y is the height, in meters, of the rocket above the ground. how far horizontally from its starting point will the rocket land? a. 0.56 m b. 215.56 m c. 431.11 m d. 215.74 m

Worth 30 points! in this diagram, both polygons are regular. what is the value, in degrees, of the sum of the measures of angles abc and abd?

Kai walked one and two-thirds of a mile on saturday and four and one-sixth of a mile on sunday. how many miles did kai walk?