[填空题]
A factory produces ba ddpr;/gpdx*a)k vt80rs in the sha3rkgbqcn- 2(hpe of a cuboid, with a fixed height of 30 cm and varying base. The area, A, of each bar base i-r g(ch2bnk3q s described by the function
A(x)=x(40−x),5≤x≤35,where x is the length of the bar base in centimetres.
1.Bar P has a length of 10 cm. Find the volume of P. $cm^3$
2.Bar Q has the same volume as bar P, however has a different length. Find the length of Q. cm
3.Find the value of x that makes the bar's volume a maximum, and state this maximum volume.
