In the United States we have a. a flat income tax system
b. a progressive income tax system
c. federal income set at a national level tax plus
different income tax rules and percents for each
state
d. a voluntary tax system

a flat income tax system

a flat income tax system

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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51840000 cm 2

step-by-step explanation: