Question

please answer llllllllllllllll

Answer 1

4/(2+1.73+2.645)
4/(6.375)
0.62745

Answer 2

4/(2+√3+√7)

multiplying by (2+√3-√7)/(2+√3-√7)

4(2+√3-√7)/(2+√3-√7)(2+√3+√7)

=4(2+√3-√7)/ (2+√3)²-7

=4(2+√3-√7)/4√3

=2+√3-√7/√3

=(2√3+3-√21)/3