How many counterexamples do you need to prove a conjecture to be false

If x+y=2 and x-y = 1 then

A recipe calls for 2 L of milk. Damien wants to make 75% fewer servings than the recipe makes. Which expression represents how many liters of milk Damien should use? a. 1/4*2 b. 3/4*2 c. 5/4*2 d. 7/4*2

What is (x+3) (4x+2) ?

How do you solve k/2+9=30

The value of a mutual fund increased by 3 1/8%. Write 3 1/8% as a fraction in simplest form. Justify your answer

Is negative square root of 35 rational or irrational?

Which polynomial is a trinomial? 6 - 2x^3 - 4x^2 + x^5 1 - 2x + 5x^4 1-x 2p^3 - p

Euler's formula, V - E + F = 2, relates the number of vertices V, the number of edges E, and the number of faces F, of a polyhedron. Solve Euler's formula for E.

Are all prime numbers greater than 2 odd number. are all composite numbers even numbers.

What is 15 divided by 10.05 in the standard algorithm 1 way