The altitude (a) {in feet} of a plane t minutes after liftoff is given by a= 3400t + 600 How many minutes after liftoff is the plane at an altitude of 21,000ft?

Julia is going for a walk through the neighborhood. what unit of measure is most appropriate to describe the distance she walks?

Adam plans to choose a video game from the section of the store where everything is 75% off. he writes the expression d-0.75d to find the sale price of the game if the original price is d dollars. gena correctly writes another expression, 0.25d, that will also find the sale price of the game if the original price is d dollars. use the drop down menus to explain each part of adams and rena's expression

Aquadrilateral has exactly one pair of parallel sides. which name best describes the figure?