The value of −18+12+(−8)+(−4) is
⇒[−18+12]+[(−8)+(−4)]=[−6+(−8−4)]=[−6+(−12)]=[−6−12]=−18
In the given figure, if yx=5 and zx=4, then the value of x∘ is(a) 8∘(b) 18∘(c) 12∘(d) 15∘