Which is a counterexample that disproves the conjecture?

for all real numbers n, 2^n ≥ 1.

a. n = 0
b. n = 0.5
c. n = –1
d. n = 3

The best and most correct answer among the choices provided from your question about conjectures is the third choice or letter C. n = -1, it is because:

2^(-1) = 0.5, which is lesser than 1 and does not agree with the conjecture. I hope it has come to your help.

-2x + 7 = 7

subtract 7 from both sides.

-2x = 0

divide both sides by -2.

x = 0

the value of x is equal to 0.