Can someone please help me please

And employee salary increased by $4500 which represents a 15% raise what is the rate of the increase

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.

What is the length of the missing leg in this right triangle? 18 mm 24 mm 26 mm 32 mm