найдите площадь трапеции, вершины которой имеют координаты (4;2), (10;2), (10;9), (8;9)

Какова причина переименования области в край?

Пожалуйста помогите решить задание 

Представьте выражение в виде произведения 

а)  (2а+5)-49  

б) (2а+b)^2-(a-2b)^2 

Плииз помогите решить

a) Mike can`t have stolen / might steal / must have stolen / could steal the necklace as his finger prints were fund all over it.

b)Hilary`s late! Her car might  break bown / could have broken down / can`t have broken down / could break down ithough that seems father unkely as it`s a new one.

c)on an`t have stolen / must have stolen / might have stolen / could have stolen the money - he was with me all afternoon.

d)he Marie Celeste can`t have been attacked / could attack / might have been attecked / might attack by pirates but we will never know.

e) My  mobile phone doesn`t work - l could forget / can`t have forgotten / must have forgotten to recharge it 

g)Luce isn`t in school today. She might be / could have been / can`t be ll

h)You iook so well and rested,you could have / might have had / must have had  / may have a lovely holiday!