What’s the area of this shape

16.5 square units

Step-by-step explanation:

area(trapezoid) = ((b1 + b2) / 2)(h)

base 1: 9

base 2: 3

height: 3

area = ((9 + 3) / 2)(3)

area = (11/2)(3)

area = (5.5)(3)

area = 16.5

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.

-12 > a

step-by-step explanation:

-11 > 1 + a

subtract 1 from each side

-11-1 > 1-1+a

-12 > a