There are 30 students in a class. the teacher will choose 2 students at random to represent the class at an assembly. how many groups of 2 students can be chosen? a. 870 b. 435 c. 60 d. 15

In trapezoid efgh, m∠gfe=63∘. identify m∠ghe. !

Apark is in the shape of a rectangle. the park authorities are planning to build a 2-meter-wide jogging path in the park (shown as the shaded region in the image). what is the area of the jogging path? plz

How many kilograms of a 5% salt solution and how many kilograms of a 15% salt solution must be mixed together to make 45kg of an 8% salt solution?