X - (25/100 * x) = 2325
x (1 - 0.25) = 2325
x = 2325 / 0.75
x = 3100
1/5+1/7=12/35 of one room painted per hour
1 room/(12/35)=35/12 hours per room working together
☺☺☺☺
11a. I can't show the workings because I don't have pie on my keyboard. am so sorry but number 11a's answer is 6
11b = 10
Answer: y=-6/7x
Step-by-step explanation: A perpendicular slope is opposite reciprocal. The opposite reciprocal of 7/6 is -6/7. The equation of the perpendicular line is y=-6/7x.