Arthur had $90. he spent $40 and gave $20 to his brother. what fraction of arthur's money is left?

In the diagram of circle a what is m

Determine whether the quadrilateral below is a parallelogram. justify/explain your answer (this means back it up! give specific information that supports your decision. writing just "yes" or "no" will result in no credit.)

Iq scores for adults age 20 to 34 years are normally distributed according to n(120, 20). in what range does the middle 68% of people in this group score on the test?