Point M is the midpoint of AC, find the coordinates of the missing endpoint when you are given one endpoint and the coordinates of the midpoint.
M(-1, 5) and A(-4, 3)

When i add money am i supposed to make it like this 7+12 or 7.00+12.00 because i got 19 dollars for my answer

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

Which geometric principle is used to justify the construction below?