PLS HELP! use metric prefixes to give a measurement equal to a volume that is 1/1000000000 the volume of 1 liter

Solve the system of equations y= 3/2 - 1, -x+ y =-3

If the altitude is drawn to the hypotenuse of a right triangle, then the two triangles formed are similar to the original triangle and to each other. which set of triangles shows the similar triangles created by the altitude in the diagram?

At store a, erasers are sold individually. the cost y of x erasers is represented by the equation y=0.75x. the costs of erasers at store b are shown in the graph.