6. Which is an irrational number?
A. -2.5
B.0.666..
C. 1.75
D. 3.1415..
7. Which of the following is NOT a perfect
square?
A. 49
B.100
C. 149
D. 225
8. Which of the following is the principal root of
√100?
A.10
B.20
C.50
D. 200
9. What is the radicand in the expression √25?
A. 2
B.5
C. 25
D. 50
10. Which of the following is NOT true about
√64?
A. The principal root of √64 is 8.
B. The radicand of √64 is 64.
C.√64 is an irrational number.
D. √64 is a rational number.

paki sama po yung no.11 nasa picture please!​