A lending library has a fixed charge for the first ^@40{\space} days^@ and an additional charge for each day thereafter. Brian paid ^@€ 61^@ for a book he kept for ^@90{\space}days^@ while Elli paid ^@€ 31^@ for the book she kept for ^@60{\space} days^@. Find the fixed charge and the charge for each extra day.
The three vertices of a parallelogram ^@ABCD^@ taken in order are ^@A(-6,4)^@, ^@B(-2, 4)^@ and ^@C(-4, 0)^@. Find the coordinates of the fourth vertex ^@D^@.
The difference between circumference and diameter of a circular plot is ^@ 39 \space m^@. Find the area of the circular plot. ^@ \left( \text{Assume } \pi = \dfrac{ 22 }{ 7 } \right) ^@
A wooden toy rocket is in the shape of a cone mounted on a cylinder as shown in the figure. The height of the entire rocket is ^@ 37 \space cm, ^@ while the height of the conical part is ^@ 29 \space cm. ^@ The base of the conical portion has a diameter of ^@ 16 \space cm, ^@ which the base diameter of the cylindrical portion is ^@ 11 \space cm. ^@ If the conical portion is painted orange, find the area of the rocket painted with orange colours.
A box contains 6 yellow and 7 green balls. Anton takes out a ball, puts it back, and then takes out another ball. What is the probability that both balls were yellow?