the number of bricks ,b, that a man can carry varies inversely with the mass of each brick, m kg, hence find the number of 3 1/2kg bricks that he can carry

Ineed with question three. i don't understand how i'm supposed to achieve 3 marks.

0. a square do not enter sign has a height and width of feet. will the area of the sign be greater than or less than 2 1/2 square feet? explain how you know and then find the actual area.

Evaluatethe expression 7.5-3.2+4(raised to the third power) / 2