Identify the expression as a numerical expression or a variable expression. for a variable expression, name the variable.

1 × 12

a. numerical expression

b. variable expression; a is the variable.

c. variable expression; there is no variable.

d. variable expression; l is the variable.

Graph y = -|x| + 2. click on the graph until the correct one appears.

Find the volume of the solid obtained by rotating the region enclosed by the curves y=1x and y=7^-x about the x-axis. (use symbolic notation and fractions where needed.) volume =

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