Use two or three unit fractions to convert. 1515 daysdaysequals= secondsseconds

Fifteen days is equivalent to 1,296,000 seconds, or one million two hundred ninety-six thousand seconds.

1. to solve this problem, you must apply the formula for calculate the surface area of a cylinder, which is:     a=2πr²+2πrh    a is the surface area of the cylinder.  r is the radius of the cylinder.  h is the height of the cylinder.    2. let's call the smaller ganza "a" and the other one "b".    3. the surface area of the ganza "a" (aa) is:     aa=2πr²+2πrh    r=diameter/2  r=3.5 cm/2  r=1.75 cm    h=10 cm    4. when you substitute these values into the formula, you obtain:     aa=2πr²+2πrh  aa=2π(1.75 cm)²+2π(1.75 cm)(10 cm)  aa=41.125π cm²    aa=129.0 cm²      5. the surface area of "b (aa) is:     ab=2πr²+2πrh    r=5.5 cm/2  r=2.75 cm    h=24.5 cm    6. when you substitute these values into the formula, you obtain:     ab=2πr²+2πrh  ab=2π(2.75 cm)²+2π(2.75 cm)(24.5 cm)  ab=149.875π cm²  ab=471.0 cm²