1. An approximate value for the number of seconds in a year is x10⁷. Whether this approximation is good or bad depends on how accurate an answer you need in the calculation you are using this for. What is the fractional error in this approximation? Give your answer in percent (you will have to convert the decimal to percent). That is, if the difference between this approximation and the true value divided by the true value is 0.001, then the fractional error is 0.1%.

2. The surface area of a sphere grows with its radius in proportion to the radius squared. If a given sphere has surface area 100m², what is the surface area in square meters of a sphere with 3 times the radius?