What is the image of (2,-4) when it is reflected in the x axis

Plz ! what is the volume of this pyramid? with numbers of 30cm 14cm 18cm

The lengths of all sides of a triangle are integers when measured in decimeters. one of the sides has length of 1 dm and another of 3 dm. find the perimeter of the triangle.'

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%