Q57 of 97 Page 107

20° C less than the present temperature.

Let the present temperature be x°c

∴ required expression is (present temperature – 20°c)

∴ required expression is (x-20)°c

The number of lines that can be drawn through a point is a variable.

One more than twice the number.

The successor of an integer.

The perimeter of an equilateral triangle, if side of the triangle is m.