(4−1)(4+1)+2(−)

Can someone help me with this? It's supposed to be "Simplify the Equation"

Your friend swims on the school team. in his first four races, his times are 24.7, 23.5, 25.6, and 27.2 seconds. which time listed for his next race would make the range larger?

Which of the following is closest to 32.9 x 7.5? a: 232 b: 259 c: 220 d: 265

Aregular hexagonal pyramid has a base area of 45 in2 and a lateral area of 135in 2. what is the surface are are of the regular hexagonal pyramid