Please help :((

1. Suppose teacher Angela gets Php42000 monthly salary and a rate of Php 400 per hour for extra teaching loads.
How much will teacher Angela earn in all if she works 15 extra hours in a month?

2. A certain school had 1,500 students enrolled in 2005 and 2,100 students enrolled in 2010. If the students' population P, grows as linear function of time t, where t is the number of years after 2005, how many students will enroll in that school in the year 2020?