PLEASE HELP Which of the following is an example of quadratic equation?
A. x - 4 = 7
B. y = 1/x^2
C. y = 3x + 2
D. X^2 = 25

Find the sum of 4x^{2} -4+6 and -7^{2} +3x+1

Given the choice between receiving $1.000.000 in one month or a single penny-doubled everyday for the period of one month; which option would you choice? show your work to support your answer. (assume that 1 month=30 days)

If f(x) = x+8 and g(x) = 4x- 3, find (f+g)(x)