What is the Mach 4 exactly?

What is the Mach 4 exactly?
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isn’t it a suped up mustang. Google it
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You are flying at a constant FL 290 and a constant mach number. The total temperature increases by 5°. The CAS will: a. Remain approximately constant b. Increase by 10 kts c. Decrease by 10 kts d. Will increase or decrease depending on whether you are above or below ISA

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Last Answer : a. Remain approximately constant

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