Answer:
18. x=31
19.x=15
20. a. x=5 WXY= 28
b. YXZ=28
c. WXZ=56
To find x we use sine
Sine ∅ = opposite/ hypotenuse
x is the opposite
The hypotenuse is 15cm
sin 35° = x / 15
x = 15 sin 35°
x = 8.60
x = 9cm to the nearest tenth
Hope this helps you