3. (7w)(5w - 2)(4w - 3)
Multiple

20w2 (7w) - 23w (7w) +6(7w)

     ☝︎(The 2 is supposed to be a small one)

Step-by-step explanation:

Distribute: (7w)(5w - 2)(4w - 3) --turn it to--> 5w(4w-3)(7w)-2(4w-3)(7w)

Distribute: 5w(4w-3)(7w)-2(4w-3)(7w) --turn it to⇣

                                                    20w2(7w)-15(7w)-2(4w-3)(7w)

Distribute: 20w2(7w)-15(7w)-2(4w-3)(7w)--turn it to ⇣

                                                    20w2(7w)-15(7w)-8(7w)+6(7w)

Combine like terms: 20w2(7w)-15(7w)-8(7w)+6(7w)--turn it to⇣          

                                                                  20w2(7w)-23w(7w)+6(7w)

hope this helps!

24

step-by-step explanation:

i assuming that 2 sides are 6 the other 2 sides are 4 cm so 6 times 4 is 24 : )