Which expressions are differences of squares?

select each correct answer.

t^2−1

n^2−225

k^2+81

p^2−40

If 2(a^2+b^2)=(a+b)^2 then, > a+b=0, > ab=0, > a=b, > 2a=b

Evaluate the expression. (9 + 5)(3 + 2)0

Frank owns a $141,000 home, for which he has a 30-year mortgage in the amount of $700 a month. once he has paid off mortgage, how much will he have paid in investment? a. $111,000 b. $109,000 c. $120,000 d. $141,000