It is estimated that a certain beach has grains of sand. The beach has an area of 3.6 million
Square feet. How many grains of sand are there on average per square foot of sand? Round to 3
Significant digits.

Question

It is estimated that a certain beach has  grains of sand. The beach has an area of 3.6 million
Square feet. How many grains of sand are there on average per square foot of sand? Round to 3
Significant digits.

Quizplus · Accepted Answer

To find the average number of grains per square foot, we need to divide the total number of grains (11ebb939_4a48_7948_9e6c_cbcecaaebbac_TB8446_11) by the area of the beach in square feet (3.6 million). This gives us:
11ebb939_4a48_7948_9e6c_cbcecaaebbac_TB8446_11 / 3,600,000 = 3.278e-6
Rounding to 3 significant digits, the answer is 3.28e-6 or 11ebb939_4a48_794a_9e6c_79d43c43d507_TB8446_11 grains per square foot. To find the average number of grains per square foot, we need to divide the total number of grains by the area of the beach in square feet. Converting 3.6 million square feet to scientific notation gives us 3.6 x 10^6 square feet. Therefore, the calculation is:

11ebb939_4a48_7948_9e6c_cbcecaaebbac_TB8446_11 / (3.6 x 10^6) = 3.22 x 10^4 grains/square foot

Rounding to 3 significant digits gives us 32,200 grains/square foot or 32.2 x 10^3 grains/square foot. The only answer choice that matches this is B, 11ebb939_4a48_794a_9e6c_79d43c43d507_TB8446_11.

It Is Estimated That a Certain Beach Has Grains