{4 questions } need 1. which expression has a value of 27? a.)16 – (– 11) b.)–15 – (–12) c.)10 – 17 d,)–25 – 2 2. which expression has a value of 23? a.)10 – 13 b.)–3 – 20 c.)7 – (–16) d.)–18 – (–5) what is the value of the expression q – 39 when q = –12? a.)–27 b.)–51 c.)27 d.)51 what is the value of the expression 5 – c – d when c = 8 and d = –13? a.)–26 b.)–16 c.) 10 d.) 0

The table below shows the approximate masses of a dust particle and a grain of pollen. dust particle 0.000000778 g grain of pollen 0.00000000155 g the mass of a dust particle can be estimated and written in the form a × 10^b, where a = 8 and b = the mass of a grain of pollen can be estimated and written in the form a × 10^b, where a = 2 and b = based on the estimates, the mass of a dust particle is approximately blank times larger than the mass of a grain of pollen.