In the problems, determine whether the given planes are parallel or perpendicular, and in case they are neither, find the (acute) angle between them : \( 2 x-y+4 z=5 \) and \( 5 x-2.5 y+10 z=6 \) 📲PW App Link - https://bit.ly/YTAI_PWAP 🌐PW Website - https://www.pw.live