1.) A Saint Bernard puppy weighs 21 pounds at nine weeks old. After that, it gains pounds per week on average. How many weeks old must the puppy be if it weighs 25 pounds now?

Solve 2x+y=3 x+y=5 in substitution method

72 the length of a side of a triangle is 36. a line parallel to that side divides the triangle into two parts of equal area. find the length of the segment determined by the points of intersection between the line and the other two sides of the triangle.

Dots sells a total of 279 t-shirts ($2) and shorts ($4). in april total sales were $670. how many t-shirts and shorts did dots sell?