What is 8.9×10^3 in expanded form

What is the perimeter of an isosceles triangle with each leg measuring 2x+3 and the base measuring 6x-2?

Add. express your answer in simplest form. 12 9/10+2 2/3 = i need u guys to me find the answer to this question

The distribution of a sample of the outside diameters of pvc pipes approximates a symmetrical, bell-shaped distribution. the arithmetic mean is 14.0 inches, and the standard deviation is 0.1 inches. about 68% of the outside diameters lie between what two amounts?