Simplify the expression:
(9j + 1)(5)

45j + 5

Step-by-step explanation:

(9j + 1)(5)

5(9j + 1)

45j + 5 (distributive property)

45j+5

Step-by-step explanation:

(9j+1).55(9j+1).      5(9j + 1)45j+5

∠acb = 8°

step-by-step explanation:

∠xba lies on the circle and is half the measure of the intercepted arc ax

hence

measure of arc ax = 2 × 42° = 84°

∠acb is outside the circle and is

∠acb = (arcab - arcax ), hence

∠acb = 0.5 (100 - 84) = 0.5 × 16° = 8°

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.