Assume that two figures on a flat surface, a and b, are similar.

a. if the linear scale factor is 2/5, then what is the ratio of the areas of a and b?

b. if the ratio of the perimeters of a and b is 14: 1, what is the ratio of the areas?

c. if the area of a is 81 times that of b, what is the ratio of the perimeters?

Each person in an it department of 25 people works on at least one of 3 major projects: system security, program implementation, platform development. 10 people work on system security, 13 work on program implementation, and 12 work on platform development. 4 people work on system security and platform development, 5 people work on program implementation and platform development, and 2 people work on all three projects. how many people work on system security and program implementation?

An ant travels at a constant rate of 30cm every 2 minutes. at what speed does the ant travel per minute

14+2 (56-1) this is an arithmetic sequence