Whats 0.64 divided by 4 using standard algorithm

Plzzz plzz maths ! quadratic sequences =an^2+bn 1) 1,6,15,28,45 2)5,18,39,68,105 3) 1,8,21,40,65 4) 7,24,51,88,135 5) -1,2,9,20,35

The square pyramid has a volume of 441 cubic inches. what is the value of x? 1/7x is the height x is the base

52 cm radius = diameter = area = circumference = circumfer