Asap

which expressions are differences of squares?
select each correct answer.
a^2+1
x^2−169
h^2−20
t^2−4

Differnce is
a²-b²

frst one is not, that is sum
2nd one is, x²-13²
3rd on e is not, 20 is not a perfect square (but you could do h²-(√20)²)
4th one is t²-2²

2nd and 4th

38 dollars is your answer.