Matt and his friends paid $30 for each 4 sandwiches and 4 bottles of water. each sandwich costs the same amount. the bottle of water cost $2 each. the equation 4 (x+2)=30 can be used to determine x, the cost of each sandwich. matt solved the equation using the following 4 (x+2)=30 4x+2=30 4x=28 x=7. therefore, matt calculates the cost of each sandwich as $7. did matt solve the equation correctly?

Which statement accurately explains whether a reflection over the x-axis and a 180° rotation would map figure acb onto itself?

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?

Assume that 1400 births are randomly selected and 1378 of the births are girls. use subjective judgment to describe the number of girls as significantly high, significantly low, or neither significantly low nor significantly high. choose the correct answer below. a. the number of girls is neither significantly low nor significantly high. b. the number of girls is significantly high. c. the number of girls is significantly low. d. it is impossible to make a judgment with the given information.