The amount of energy it takes to lift a box might be a function of which of the following?
A. The weight of the objects inside the box
B. The shape of the box
C. The time of day that you are lifting it

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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a.

step-by-step explanation:

step 1 distribute 2 to every term in the parentheses

step 2 add 10 on both sides of the equal sign