-5 is the same as -5/1 -5/1 - 5/3 Find the common denominator which is 3 in this case and multiply the numerator by 3 to get the two fractions to the same denominator. -15/3 - 5/3 Now subtract 5 from -15 which will be -20 -20/3 is the answer. Turn it into a decimal if needed to. Or mixed fraction -6 2/3
18+2.50=20.50 so tax is 10% so you can put that into a calculator as 20.50*0.10 which equals 2.05 so just add 20.50 and 2.05 which is 22.55 is your final answer
