From the conditions given, the approximate density altitude is

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GIVEN:

Pressure altitude 12,000 ft
True air temperature +50 °F

(Refer to figure 11.) If the cruise altitude is 7,500 feet, using 64 percent power at 2,500 RPM, what would be the range with 48 gallons of usable fuel?

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What is the approximate flight time available under the given conditions? (Allow for VFR day fuel reserve.)

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(Refer to figure 12.) GIVEN:

Pressure altitude 18,000 ft
Temperature -21 °C
Power 2,400 RPM –28″ MP
Recommended lean mixture usable fuel 425 lb

What is the maximum available flight time under the conditions stated?

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(Refer to figure 34.) GIVEN:

Pressure altitude 6,000 ft
Temperature +13 °C
Power 2,500 RPM – 23″ MP
Usable fuel available 460 lb

What is the maximum rate of climb under the given conditions?

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(Refer to figure 33.) GIVEN:

Weight 4,000 lb
Pressure altitude 5,000 ft
Temperature 30 °C