Can you please answer the following two questions?

Find Pressure Ratio at Indicated Sea Level.

Barometric Altimeter setting: 29.42 in.Hg

Outside Air Temperature at sea level: 49 deg F Atmosphere Table 2.1

1.0169

0.9833

0.8625

0.5328

Find Calibrated Airspeed (KCAS).

Pressure Altitude = 20,000 ft

Indicated Airspeed = 250 KIAS

Atmosphere Table 2.1

Compressibility Correction Figure 2.6

Position error correction chart provided

248 KCAS

240 KCAS

252 KCAS

260 KCAS