How do you solve
x^2 - 4x - 12 = 0

The standard distance between studs in a house is 1.5 feet. if you have a set of blueprints for a house that mark every 1.5 feet with 2 in., by how many inches will a 13-foot wall be represented?

Which shows the correct substitution of the values a,b and c from the equation 1=-2x+3x^2+1

The ratio of the measures of the three angles in a triangle is 2: 9: 4. find the measures of the angels