-7y=7x+21
i don't know what to do can yall help me pls

If i have a 24 in loaf of bread and i cut it into two pieces one 9 in how long was the other

Which representation has a constant of variation of -2.5

At the beginning of 1974/75,2 years a man invested #2000 in a bank at 12.5% compound interest, if it degree #650 at the end of each two years to pay his son's school fees, after payment of interest to pay his son's school fees, how much did he have left at the beginning of the 1978/79 school year?