How can i calculate a certain decimal given a length? let's say n is a decimal, and i want that decimal to be a length of 3. the output needs to be .001. if n's length was 2, it would be .01, etc.

Arley is building a model of a city map. in one part of the city, three roads form a right triangle, which harley draws as triangle abc, with the following measures: m∠b=90° and m∠a=30°. in his scale model, the hypotenuse of triangle abc, ac¯¯¯¯¯¯¯¯, has a length of 817−−√ cm. what is the value of a (the length of bc¯¯¯¯¯¯¯¯)?

Haley buys 9 pounds of apples for $3. how many pounds of apples can she buy for $1?

Lena reflected this figure across the x-axis. she writes the vertices of the image as a'(−2, 8), b'(−5, 6), c'(−8, 8), d'(−4, 2).