In triangle $PQR$, $PQ = 13$, $QR = 14$, and $PR = 15$. Let $M$ be the midpoint of $\overline{QR}$. Find $PM$.

Can someone check if i did this right since i really want to make sure it’s correct. if you do you so much

If the ratio of sum of the first m and n terms of an ap is m2 : n2 , show that the ratio of its mth and nth terms is (2m − 1) : (2n − 1).

At the beginning of year 1, carlos invests $600 at an annual compound interest rate of 4%. he makes no deposits to or withdrawals from the account. which explicit formula can be used to find the account's balance at the beginning of year 5? what is, the balance?