Evaluate the following expression if x=4 28x - 9 (2x+ 6)

-14

Step-by-step explanation:

substitute 4 for x

28(4) - 9 (2(4)+ 6)

multiply

112-9(8+6)

add numbers

112-9(14)

multiply

112-126

subtract

-14

option 1

data plot with   3 dots over 33, 1 dot over 34, 2 dots over 35, no dot over 36, 1 dot over 37, 2 dots over 38, 4 dots over 39, and 2 dot over 40.

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.