Vẽ hai góc xAy và góc yAz kề bù .Trên nửa mặt phẳng bờ xz không chứa tia Ay , vẽ tia At sao cho xAy=zAt a, Chứng tỏ: tia At và tia Ay đối nhau

Someone this asap for a group of students attends a basketball game. * the group buys x hot dogs at the concession stand for $2 each. * the group buys y drinks at the concession stand for $3 each. the group buys 29 items at the concession stand for a total of $70. how many hot dogs did the group buy?

Liz had 140 pens and inna had 100 pens. after inna gave liz some pens, liz had 3 times as many pens as inna. how many pens did inna give liz?

What number is 7 units left of -15?