The similar triangles shown below are measured in units. The ratio of Triangle XYZ to Triangle ABC is 1:2. What is the length, in units, of XY? A. 3 B. 4 C. 6 D. 10

For one history test, keith had to answer 40 questions. of these 40 questions, keith answered 28 of them correctly. what percent did keith get on his history test? round your answer to the nearest tenth if necessary

Four congruent circular holes with a diameter of 2 in. were punches out of a piece of paper. what is the area of the paper that is left ? use 3.14 for pi

State if the two triangles are congruent. if they are, state how you know?