Which equations illustrate the commutative property of addition?

choose exactly two answers that are correct.

a.
–5 + [6 + (–4 + 3.1)] = – 5 + [(–4 + 3.1) + 6]

c.
–7.4 + (13 + 2.1) = (–7.4 + 13) + 21

d.
–9 + 11 = 11 + (–9)

Mr and mrs smith buy tickets for themselves and their four children. the cost of an adult ticket is ? 6 more than the adult ticket. the total cost of the six tickets is ? 40.50 work out the cost of an adult ticket. in your working let c be the cost of the child ticket and a be the cost of the adult ticket.

The number of 8th graders who responded to a poll of 6th grade and 8 th graders was one fourtg of the number of 6th graders whi responded if a total of 100 students responddd to the poll how many of the students responded were 6 th graders

Which expression is equivalent to 16 in exponential form? a) 4 × 4 b) 8 × 2 c) 23 d) 24