Question

Math help again please!! :))

Answer 1

first one:
x^2 = 25^2 - 22^2
x^2 = 625 - 484
x^2 = 141
x = √141
answer is C.  √141

second:
right triangle
c^2 = a^2 + b^2

answer is a.
a^2 + b^2 = c^2