Calculate the total area of the triangular prism.

Can some one explain how to slove specifically, what is the value of x? 0.9(x+1.4)-2.3+0.1x=1.6 enter the answer as a decimal in the box. x= ?

What is the product? a-3/15a × 5/a-3

What unit of been sure would be appropriate for the volume of a sphere with a radius of 2 meters