Ivan wrote the ratio incorrectly. The ratio should be written as the old length to the new length, so it should be <span>35/10</span><span>, which reduces to </span><span>7/2</span><span>. When going from larger to smaller dimensions, the change in the scale factor is a ratio that looks like an improper fraction, with a larger number in the numerator and a smaller number in the denominator.</span>
The strings cost $14. you would take the total cost ($72) and subtract the cost of the book ($16) and you would get $56. you would then divide 56 by the number of book bought (4 in all) and you would get $14.
