Need help on both questions please

What value of x is in the solution set of –5x – 15 > 10 + 20x?

The function show two sisters' savings account and the rate at which they plan to deposit money

In the field of thermodynamics, rankine is the unit used to measure temperature. one can convert temperature from celsius into rankine using the formula , what is the temperature in celsius corresponding to r degrees rankine? a. 9/5(c - 273) b. 9/5(c + 273) c. 5/9( c - 273) d. 5/9( c + 273)