What’s the answer guys

Step-by-step explanation:

Since this is a right angle triangle we can apply trigonometry formulae

SOH, CAH and TOA

In this case, we are going to apply Sine because we have opposite and hypotenuse

Then,

Sinθ=opposite/hypotenuse

Sin20=x/18

Cross multiply

x=18sin20

x=6.156

x is approximately 6.2 to the nearest tenths

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.