What is 7 tenths minus 2 tenths?

How can 1 4 7 9 equal 24 using each number once? If it takes 2 people to wash a car in one quarter of an hour how long will it take 1? What is the use of trigonometry in construction? What is the effect of surface material on how far a toy car will roll from the bottom of a ramp? How many faces does the rectangle have? What is the mathematical statement for five less than the number y? What is the prime factorizaton of 24? What function of a mordant? Is 1.80 a round number? What is the number and word notation for the number 400436500500? What is LI in roman numeral? What is the binary equivalent of 63? What is a common denominator for 2 3 and 7? How do I find the speed of a vehicle when all I know is the length of the skid marks 24.2 metres and the pavement was wet at this time with a very slight slope down? How many spaces do you take after a semi colon? What fraction of carbon-14 will remain in the fossil of an organism that died 23080 years old? What is the volume of a square based pyramid with base side lengths of 16 meters a slant height of 17 meters and a height of 15 meters? What would be your answer if you round 54.008 to the hundredth place? How many cups fit in to a gallon? Do congruent figures have to be facing the same direction?