The ratio of boys to girls in Ms. Sim's class is 2 to 3. There are 18 girls in the class. What is the total number of
students in Ms. Sim's class?
A.12
B.30
C.45
D.27

Which math sentence can be used to determine if the triangle is a right triangle?

Researchers were interested in whether relaxation training decreases the number of headaches a person experiences. they randomly assigned 20 participants to a control group or a relaxation training group and noted the change in number of headaches each group reported from the week before training to the week after training. which statistical analysis should be performed to answer the researchers' question?

Gregory draws a scale drawing of his room. the scale that he uses is 1 cm : 4 ft. on his drawing, the room is 3 centimeters long. which equation can be used to find the actual length of gregory's room?