Question

Which is a counterexample that disproves the conjecture?

A student concludes that if x is a positive real number, then x≥√x.

A. x=0
B. X=0.25
C. X=3
D. X=-1

Answer 1

any guess?

Answer 2

I think the only "real number" is c

Answer 3

no, you should give a counterexample as to why the inequality is incorrect.

Answer 4

I know but it asks for a positive real number as the answer. So I thought it could only be C but I'm not surr

Answer 5

try B to see what you get

Answer 6

1/4 >=1/2 are false

Answer 7

0.25≥√x

Answer 8

0.25≥√0.25

Answer 9

remember sqrt of 0.25 is 0.5

Answer 10

Oops! Option D isn't supposed to be negative!! Sorry

Answer 11

Okay so 0.25≥0.5. The statement is true!

Answer 12

I'm sorry NOT true lol

Answer 13

yep!

Answer 14

Thanks!!