can you please verify these answers and explain if their wrong, i want to understand

Name: 1.A hydraulic lift raises a car resting on a 25 (cm) diameter cylinder with the force of compressed air acting down on a 5 (cm) diameter piston. The force required from the compressed air to support a car of mass 1000 (kg) is about a. 3,000 (N) b. 1750 (N) (C. 392 (N) d. 375 (N) 2. Water flows at 5 meters/second through a horizontal pipe from 10 (cm) diameter. It narrows to 5 (cm) diameter. A pressure gauge in the narrow section reads 50 (kPa). What would the pressure gauge read in the wide section? a. 25 (kPa) (b. So (kPa) c. 60 (kPa) d. 67.5 (kPa) e. 475 (kPa) 3. All people come very close to being able to float in water. What is the volume (in cubic meters) of a 70-kg woman (Assume her density is the same as the density of water) a. 0.007 b. 0.035 c. 0.050 d. 0.070 e. 0.085 4. A supertanker carrying oil has a total mass of 3.8 x 108 kg. If the dimensions of the ship are those of a rectangular box 300 meters long, 80 meters wide, and 40 meters high, how much water is displaced by the floating ship? (Assume density of water is 1 g /cm3) a. 960,000 m3 (b. 600,000 m3 c. 380,000 m' d. Depends on the ship's density 5. A hydraulic lift raises a 2 000-kg automobile when a 500-N force is applied to the smaller piston. If the smaller piston has an area of 10 cm?, what is the cross-sectional area of the larger piston? a. 40 cm b. 80 cm2 c. 196 cm d. 392 cm2 e. 160 cm