Question: A faulty gauge on a fire engine pump caused the apparent pressure in the hose to change every few seconds. The pressures (in lb/in.2) above

A faulty gauge on a fire engine pump caused the apparent pressure in the hose to change every few seconds. The pressures (in lb/in.2) above and below the set pressure were recorded as: +7,−2,−9,−6. What was the change between

(a) The first two readings,

(b) Between the middle two readings

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