Principle 400 at rate of 5% is

20

Step-by-step explanation:

do 5% of 400 which gives you 20 for your answer

30 units^2

step-by-step explanation:

area is l × w

the length is 3

and the width is 10

3 × 10= 30 units squared

step-by-step explanation:

the true statements are:

r = set of real numbers

n = set of natural numbers, 1,2,

w = n u{0} = {0,1,}