In right triangle RST, right angled at S, B is a point on STsuch that SB=2/3ST .Prove that 9RB^2= 9RS^2+ 4ST^2

Which solid has two triangular bases and three lateral faces, each in the shape of a rectangle? triangular prism triangular pyramid rectangular prism rectangular pyramid

What are the measures of ∠a, ∠b, ∠c and ∠d? explain how to find each of the angles. measure need asap

Valentina is subtracting from . she finds the lcd to be 15y2. what is valentina's next step?