Find all the solutions on the interval [0,2π). sin[x+ π 4 ]+sin[x− π 4 ] = −1

Can you please also show all the steps on how you solved this I am having a hard time understanding this concept.

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?

This is about circle theorems. someone asap : (

Jane’s favorite fruit punch consists of pear, pineapple, and plum juices in the ratio 5: 2: 3. how many cups of pear juice should she use to make 20 cups of punch?