Which if the following is not a characteristic of both observational studies and experiments
a . the subjects are observed, and their behavior is recorded
b. results are not used to prove cause and effect
c data are collected about population
d. the researcher exercises direct control over at least one variable

Solve x+3y=6 and 4x-6y=6 by elimination . show work !

Does the construction demonstrate how to copy an angle correctly using technology a) yes the distance between points a and f was used to create circle h b) yes the distance between points f and g was used to create circle h c) no the distance between points a and f was used to create circle h d) no the distance between points f and g was used to create circle h

Which problem would you use the following proportion to solve for? 24/x=40/100 a. what is 40% of 24? b. what percent is 24 of 40? c. twenty-four is 40% of what number? d. forty percent of 24 is what number?