Could you help me with this MatLab question please?

When an object with an initial temperature T is placed in a substance that has a temperature S, according to Newton's law of cooling, in t minutes it will reach a temperature T_t using the formula R_t = S + (T-S)e^[-kt] where k is a constant value that depends on properties of the object. For an initial temperature of 100 and k=0.6, graphically display the resulting temperatures from 1 to 10 min for two different surrounding temperatures: 50 and 20. Use the plot function to plot two different lines for these surrounding temperatures, and store the handle in a variable