I need help please.

9.42

Step-by-step explanation:

pretend the missing piece is still there.  Find the area of the piece first.

90/360(3.14*2^2)=

90/360(12.56)=

3.14

the whole circle's area would be 3.14(4)=12.56, since it is a 90 degree angle.

then subtract the area of the piece  12.56-3.14=9.42

50*10 is greater

step-by-step explanation:

if you add the zero from 10 to 50, it will give you a bigger number.

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,}