The mass of a fluorine atom is 3.16 × 10 - 23 g. what is the mass of 1,000,000,000 fluorine atoms? express your awnser scientific notation to three significant figures.

What is the perimeter of a rectangular building that is 80 feet wide and 140 feet deep?

Write the summation to estimate the area under the curve y = 1 + x2 from x = -1 to x = 2 using 3 rectangles and right endpoints

Given that y varies directly to the square root of (x + 1), and that y = 1 when x = 8,(a)express y in terms of .x,(b)find the value of y when x = 3,(c)find the value of x when y = 5.