When mei solved the system of equations below, she got the solution x = 1, y = 6. With out solving the equation yourself, can you tell her whether this solution is correct? How do you know ?

If a fair 6 sided cube is rolled 60 times, theoretically how many times should you expect to roll a 4 or a 5?

In the polynomial below, what number should replace the question mark to produce a difference of squares? x2 + ? x - 36

Boris needs to buy plastic spoons. brand a has a box 42 spoons for $2.37. brand b has a box of 72 spoons for $3.57. find the unit price for each brand. then state which brand is the better buy based on the unit price. round your answer to the nearest cent.