Answer:20) 9x - 321) 9x + 6022) 4x - 10Tip: when it says "___ more/less than," at the beginning you add it at the end.Step-by-step explanation:23) 190 = .10x + 15. x = the amount of copies you get for $190. subtract 15 from both sides.175 = .10xdivide by .10 on both sides.1750 = x. You can get 1750 copies for $190.24) 150w + .10m = 190. m = miles (w = week)150 + .10m = 190subtract 150 from both sides.10m = 40divide .10 on both sides.m = 400. You can drive 400 miles in one week for $190.25) Here we have to work backwards. Start off with a 1 variable equation. Since L = 2w + 2, let's replace that for the length.P = 2w + 4w + 4. (4w + 4 because perimeter is 2l + 2w, you have to double the length as well)Add the w's together and input known values.124 = 6w + 4Subtract 4 on both sides120 = 6wDivide 6 on both sides20 = w.Now we will find the length since we know the width using the equation:124 = 2(20) + 2L124 = 40 + 2LSubtract 40 on both sides84 = 2LDivide 2 on both sides42 = L.26) Do the same thing as 25.162 = 2w + 2(w + 63)162 = 2w + 2w + 126162 = 4w + 126Subtract 126 on both sides36 = 4wDivide 4 on both sides9 = w.9 + 63 = L72 = LHope this helps.