Which equations support the fact that rational numbers are closed under addition? Select each correct answer.

a 1/2 + 0.5 = 1
b 3√16 + 3√16=6√16
c √10 + (-√10)=0
d 3√5 + √5 = 4√5

Gigi earned $65 for 5 hours of gardening. she earned $90 for 9 hours of office work. which statement correctly compares gigi’s earning per hour for gardening and office work? she earned $3 more per hour for office work than for gardening. she earned $4 more per hour for office work than for gardening. she earned $3 more per hour for gardening than for office work. she earned $4 more per hour for gardening than for office work.