1.which expression has the same value as the one below? 8 + [4 + (–9)] a12 + (–9) b–12 + 9 c–4 + (–9) d4 + (–9) 2.what is the value of the expression? -16+12 a-28 b-4 c4 d28 3which expression has the same sum as the one below? –15 + 6 a15 + 6 b–6 + (–15) c15 + (–6) d6 + (–15)

The average number of vehicles waiting in line to enter a parking lot can be modeled by the function f left parenthesis x right x squared over 2 left parenthesis 1 minus x right parenthesis endfraction , where x is a number between 0 and 1 known as the traffic intensity. find the rate of change of the number of vehicles waiting with respect to the traffic intensity for the intensities (a) xequals0.3 and (b) xequals0.6.

Determine the difference: 3.2 × 1010 – 1.1 × 1010. write your answer in scientific notation.

Atriangle has a side lengths of 18cm, 80 cm and 81cm. classify it as acute obtuse or right?