Equation on 1) -6 = 9
2) 7a - 4 = = 3a + 4
3) 6y + 5 = 3y + 6
4) 5b + 2 = 3b + 10
please help​

Aladder that is 30 ft long needs to reach 27 ft up a building. what should the angle of the vertical be?

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.

Afarmer has a large field that is x feet in length. he wants to fence in a rectangular section in the middle of the field , leaving a length of 100 feet of open field behind each end of the fenced rectangle.he also wants the width of the fenced-in space to be 100 feet less than its length. find the expressions to represent the length and width of the fenced section of the field