How to know when to use middle term splitting in factorisation?

What is the value with a place of tenths in 907.456 1) 0 2) 6 3) 4 4) 5

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

If two parallel lines are cut by a transversal, interior angles on the same side of the transversal are supplementary. a. always b. sometimes c. never