Celo used the simple interest formula a=p( 1+ rt) to calculate the interest he earned on his savings last month. which equation is equivalent to the simple interest formula?
a. p = a/ 1+rt
b. p = 1 + rt/ a
c. p = a - (1+rt)
d. p = a + (1+rt)

Delbert keeps track of total of the total number of points he earns on homework assignments, each of which is worth 60 points. at the end of the semester he has 810 points. write an equation for delbert’s average homework score a in terms of the number of assignments n.