If five times a whole number increased by 3 is less than 13, rlthen find the solution set​

How do i simply this expression (quadratic formula basis) on a ti-84 or normal calculator?

Factor the trinomial below. 12x^2 - 32x - 12 a. 4(3x+3)(x-1) b. 4(3x+1)(x-3) c. 4(3x+6)(x-2) d. 4(3x+2)(x-6)

How many kilograms of a 5% salt solution and how many kilograms of a 15% salt solution must be mixed together to make 45kg of an 8% salt solution?