Awoman invests 12,500 in a savings account drawling interest that is compounded annually. find the annual rate if the money grows to 14,045 in 2 years

Two customers went to a post office. first customer paid $12 for 14 and 5 envelopes the second paid 24.80 for 10 postcards and 15 envelopes. what is cost of each envelope?

Find the center and the radius of the circle with the equation: x^2-2x+y^2+4y+1=0?

Which describes the difference between the graph of f(x)=x^2 and g(x)=-(x^2-2)