How do you calculate 145.75 plus 2.3x10-1 in scientific notation and significant figures?

145.75+2.3*10^-1

145.75+0.23

145.98

As 2.3*10^-1 has two significant figures, our answer must have two significant figures

145.98

150

As the 5.98 rounds up to the nearest significant figure

1.5*10^2