How could you calculate 23% of a number explain

What is the perimeter of square abcd? units units 28 units 37 units

For the rule of 78, for a 12-month period, the last term in the sequence is 12 and the series sums to 78. for an 10 month period, the last term is and the series sum is . for a 15 month period, the last term is and the series sum is . for a 20 month period, the last term is and the series sum is

Labc is reflected across x = 1 and y = -3. what are the coordinates of the reflection image of a after both reflections?