-9b+2n-4+2b

Please help

-7b+2n-4

Step-by-step explanation:

Combine like terms.

-9b+2b is -7b

as for the rest you can't combine them because they don't have anything in common

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 variable is any characteristics, number, or quantity that can be measured or counted. a variable may also be called a data item. hope i !