Sixteen is seven plus 3 times what is the number

The mean of a set of data is -3.82 and its standard deviation is 2.31. find the z score for a value of 3.99.

Molly shared a spool of ribbon with 12 people. each person received 3 feet of ribbon. which equation can she use to find r, the number of feet of ribbon that her spool originally had?

In dire need~! describe how to use area models to find the quotient 2/3 divided by 1/5. check your work by also finding the quotient 2/3 divided by 1/5 using numerical operations only.