A square frame 12in a side is placed on a wall with its base 10in above the eye-level ofan observer. If the observer is approaching the wall at the rate of3fts, how fast is themeasure of the angle subtended at the observer's eye by the frame changing when theobserver is10ft from the wall?Suppose the pressure P and volume Vof a given gas sample satisfy the Boyle's lawformula PV=C where Cis constant. If the volume is increasing at the rate of10in3s,how fast is the pressure changing when the volume is30in3 and the pressure is60lbin2?Solve # 18 and #20When the price of a certain commodity isp pesos per unit, customers demand x thousandunits of the commodity where 50sinp+x2=80. How fast is the demand changing withrespect to time when the price isF200 per unit and is decreasing at the rate of25per month?