Identify the type of function represented by f(x)(1)/(2)*(3)^(x)

Which of the following parabolas opens down?

The figure shows triangle def and line segment bc, which is parallel to ef: triangle def has a point b on side de and point c on side df. the line bc is parallel to the line ef. part a: is triangle def similar to triangle dbc? explain using what you know about triangle similarity. part b: which line segment on triangle dbc corresponds to line segment ef? explain your answer. part c: which angle on triangle dbc corresponds to angle f? explain your answer. asap

Solve the system of equations using the linear combination method. {4x−3y=127x−3y=3 enter your answers in the boxes.