PLEASE HELP If r is a linear function with a slope that is not equal to zero, which of the following is always true of its inverse function?

In the field of thermodynamics, rankine is the unit used to measure temperature. one can convert temperature from celsius into rankine using the formula c= r/1.8 - 273, what is the temperature in celcius corresponding to r degrees rankine.

Jamie went to home depot.she bought 25 bags of soil that cost $9 per bag.she bought 15 pots at $8 each, and she bought 23 bags of pebbles at $15 each.she used a coupon that gave her $5 off for every 100 dollars she spent. how much did jamie pay at the end?

Given: m∠ adb = m∠cdb ad ≅ dc prove: m∠ bac = m∠bca lol