Mary has 3/4 yards of fabric. She used 3/8 yards of fabric. How many yards of fabric does she
have left?

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

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?

7. if the value of x varies directly with the value of y, and x = 3 when y = 21. what is the valu y, and x = 3 when y = 21. what is the value of x when y = 105?