The resistance, R (in ohms), of a wire varies directly with the length, L (in cm), of the wire and inversely with the cross-sectional area, A (in cm2). A 500 cm piece of wire with an area of 0.04 cm2 has a resistance of 0.25 ohms. Find an equation that relates the variables R, L, and A.​

With finding limits of multi variable !

Acompany manufactures three types of cabinets. it makes 110 cabinets each week. in the first week, the sum of the number of type-1 cabinets and twice the number of type-2 cabinets produced was 10 more than the number of type-3 cabinets produced. the next week, the number of type-1 cabinets produced was three times more than in the first week, no type-2 cabinets were produced, and the number of type-3 cabinets produced was the same as in the previous week.

Fifty students are trying to raise at least 12,500 for a class trip. they have already raised 1,250. how much should each student raise on average in order to meet the goal? write and solve the two step inequality for this problem