Solve using any method you prefer 1 4/5 + 1 3/5

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

Daniel bought a computer game for $25 and later sold it to thomas for a 40% profit. how much did daniel sell the computer game for?

The square root of 9x plus 7 plus the square rot of 2x equall to 7