Mr Powers checks his electricity bill. Here are his meter readings.

New Reading: 6538
Old Reading: 6245

a) Use subtraction to calculate the number of units used.

b) Calculate the cost of the number of units used.

If so how is

The sum of the angles in a triangle is 180°. this is called the angle-sum property.the sum of the lengths of any two sides of a triangle is greater than the length of the third side. similarly, the difference between the lengths of any two sides of a triangle is less than the length of the third side.the side opposite to the largest angle is the longest side of the triangle and the side opposite to the smallest angle is the shortest side of the triangle.