1. The scale of a map is 1 : 20 000. Find the area represented by 6·3 cm2 2. The scale of a map is 5 cm : 2 km. Find the area represented by 30 cm2
3. Find the representative fractions of a map where 0·25 cm2 represents 0·64 km2
4. Find the representative fractions of a map where 1 cm2 represents 9 km2

the dimensions are:

step-by-step explanation:

we want to find the dimensions of a rectangular box with volume of

we factor to obtain;

we rewrite the rightmost factor to obtain;

recall that:

we apply difference of two squares formula to obtain;

hence the dimensions are

because linear equations are a lot simpler than quadratics equations, and linear equations formula is a lot easier to memorize. that's why i think they're harder.