(a + b + c) power of 10 - abc

Tip
A=1
B=2
C= -3

If a 36 inch yardstick casts a 21 foot shadow, how tall is a building whose shadow is 168 feet? what is the scale factor

Using elimination, what is -4x+2y=-12 4x+8y=-24

If you were constructing a triangular frame, and you had wood in the length of 4inches, 4 inches, and 7 inches, would it make a triangle? would you be able to create a frame from these pieces of wood? yes or no. explain your mathematical thinking