The cost, y, for x pounds of nails can be represented by the equation y=3.20x. What is the constant of proportionality of the equation? HELLPPP PLEASE THIS IS FOR A TEST

Asphere has a diameter of 10 in. what is the volume of the sphere?

Rectangle bcde is similar to rectangle vwxy. what is the length of side vy? a) 1 7 b) 2 7 c) 3 7 d) 4 7

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