Solve the system. x + 2y - 5z = 10
y + 2z = 2
z = -1
Enter your answer as an ordered triple.
help please​

Which expression is equivalent to 2x^2+7x+4?

Hector and alex traded video games. alex gave hector one fourth of his video games in exchange for 6 video games. then he sold 3 video games and gave 2 video games to his brother. alex ended up with 16 video games. how many video games did alex have when he started?

Carley bought a jacket that was discounted 10% off the original price. the expression below represents the discounted price in dollars, based on x, the original price of the jacket.