919
The answer is 919. Simply add the numbers together arithmetically as you would for the problem two plus two. To check your work, a calculator is the best option.
43.25
187
450
173
174
301 + 173 + 427 = 301 + (173 + 427) = 301 + 600 = 901
148 + (216 x 351) - 173 = 75791
x2 + 4 = 173 x2 = 173 - 4 = 169 x = sqrt(169) = 13 or -13
173 plus 127 equals 300
280
88+85 = 173