The diameter of a certain star is about 6.8 * 10^6 km express this distance in standard form.
the star's diameter is about
how many km.

Which expression is equivalent to7_/x^2 ÷ 5_/y^3? assume y# 0

Awater holding tank measures 105 m long, 50 m wide, and 8 m deep. traces of mercury have been found in the tank, with a concen- tration of 60 mg/l. what is the total mass of mercury in the tank? answer in units of kg.

The areas of two similar triangles are 72dm2 and 50dm2. the sum of their perimeters is 226dm. what is the perimeter of each of these triangles?