Which quadratic function in vertex form can be represented by the graph that has a vertex at (3.-7) and passes through the point (1, -10)?
A. y =(x+3)2 +7
B. y = -(x + 3)2 – 7
c. y =(x - 3)? +7
D. y = -(x - 3)2 - 7

reduce the friction between its moving parts

step-by-step explanation:

in fact, by reducing the friction between the moving parts of the machine, it is possible to reduce the energy wasted due to this friction; therefore, more input energy is converted into useful work, and this will improve the efficiency of the machine.

answer is c

step-by-step explanation:

81/12=324/x

x=48