solve the questions. please I need fast answers

Question Find the extreme values for function fox) = HS( 3 4x 2 4 xx +5 Question 2 thestudents were determining The density of an unknown piece of metal, The puce of is spherical in shape ( ball ) and the student determined the radius of the sphere to be 501cm with an error of Odem. The students also weighed the piece and got mass of 4.3kg to.3kg- rise the differential and find the relatwe error of the density when The density is calculated as p= M and the volume of The sphere can be calculated as V= 4 1 1, 3 B