Simplify.

9(y + 7)

7 y + 9
63 y
9 y + 63
16 y

The weight of an object in a particular scale is 175.2 lbs. the measured weight may vary from the actual weight by at most 0.1 lbs. what is the range of actual weights of the object

How many $20 bills do you need to have to make $280

The length of the line segment joining the midpoints of sides ab and bc of the parallelogram abcd is 10. find the length of diagnol ac