There are 12 people having lunch. each person wants 1/3 of a sub sandwich. how many whole sub sandwiches are needed?

Aresearch company wants to test the claim that a new multivitamin to improve short term memory. state the objective of the experiment, suggest a population, determine the experimental and control groups, and describe a sample procedure.

How to determine whether two known pairs of points are on the same line.

If the ratio of sum of the first m and n terms of an ap is m2 : n2 , show that the ratio of its mth and nth terms is (2m − 1) : (2n − 1).