Please Help Me With These

Write the summation to estimate the area under the curve y = 1 + x2 from x = -1 to x = 2 using 3 rectangles and right endpoints

If f(x)=3 over x+2 - square root x-3 then f(7)=

I6.8.4 test lucas took out a car loan for $14,475 that has a 0% apr for the first 16 months and will be paid off with monthly payments over 5 years. for how many months will lucas be charged interest?