How can i figure out the answer to 7+5=_+6

Which expression is equivalent to (9x - 3 1/ + 1 3/8)

Scrub a dub toothbrushes are $4.00 each. there is a 10% discount, but there is also a 6% sales tax after the discount is applied. what is the new price after tax? round to the nearest penny

Use the data on the dot plot to answer the question. how many people read for more than three hours last week? i'm on a unit test review