How does an equation show the relationship between variables and
other quantities in a situation?​

An equation is basically a way to show a relationship of variables (x,y,a,b, etc) and numbers. The relationship between these numbers and variables is a lot like a laundry bag. ... The amount of shirts and pants in each of those laundry bags could be counted separately, or if you combine them, counted together

An equation is distinct because it has an equals sign, and that in itself creates a relationship. Usually, it's relating the left side to the right side in terms of that fact that they're equal to each other- unlike inequalities which form more of a relation between two quantities that can be greater than or less than.

d) 30 units^2

area of rectangle = l × b

we know,

length = 10 unit

breadth = 3 unit

applying the formula,

= l × b

= 10 × 3

= 30 unit^2

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