In Exercise, solve the given problems. Refer to Appendix B for units of measurement and their symbols.
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, and (c) the last two readings?
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