Find the value of x in each case. will be posting more questions soon.

Adj has a total of 1075 dance and rock songs on her system. the dance selection is 4 times the size of the rock selection. write a system of equations to represent the situation.

The price of an item has been reduced by 30%. the original price was $30. what is the price of the item now ?

The length of a rectangle plus its width is 25 cm. the area is 156 square cm. what are the length and width of the rectangle? separate the answers with a comma.