Why is this scientific notation: 12,050,000 = 1.25×107 wrong

Use the distributive law to multiply. 3(4x + 5y + 6)

The perimeter of an equilateral triangle is 4 cm more than the perimeter of a square and the length of a side of the triangle is 8 cm more than the length of a side of the aware. find the length of a side of the equilateral triangle

Given the equation −4  = 12, solve for x and identify if it is an extraneous solution.