Divide or multiply? and is it in grams or mL?

Simplify a7/a4 a) 1/a3 b)-a/a2 c)a4/a3 d)a3

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?

In the triangles, bc =de and ac fe.if the mzc is greater than the mze, then ab isdfelth