Many drivers of cars that can run on regular gas actually buy premium in the belief that they will get better gas mileage. to test that belief, 10 cars in a company fleet were used. all the cars run on regular gas. each car was filled first with either regular or premium gasoline, decided by a coin toss. the mileage for that tank of gas was recorded. then the car was filled with the other type of gasoline and the mileage for that tank of gas was recorded. the difference in gas mileage between the two types of gasoline (premiumminusregular) for the 10 cars was recorded. a 95% confidence interval was constructed using the paired t-methods: (0.5,3.5) mpg. which of the following is the correct interpretation of this confidence interval?

Hello people, i have a math question that i need with, me, i will give the correct one brainiest, and for the other correct people, a and 5 stars.

Arectangle plot measure 20ft. by 30ft. a 3-ft.-wide sidewalk surrounds it.find the area of the sidewalk.

Submarines control how much they float or sink in the ocean by changing the volume of air and water contained in large ballast tanks. when the tanks are completely full of water, the submarine increases its overall mass and sinks down to the bottom. when the tanks are completely full of air, the submarine reduces its overall mass and floats to the surface. depending on the density of the seawater surrounding the submarine, it will pump seawater in or out of the tanks in order to achieve the same overall density as the sea water and float neutrally in the water. the volume of the submarine never changes. when the tanks are completely full of water, a submarine with a volume of 7.8\times10^3\text{ m}^37.8×10 3 m 3 7, point, 8, times, 10, start superscript, 3, end superscript, space, m, start superscript, 3, end superscript has a total mass of 8\times10^6\text{ kg}8×10 6 kg8, times, 10, start superscript, 6, end superscript, space, k, g. the density of the seawater is 10^3\text{ kg/m}^310 3 kg/m 3 10, start superscript, 3, end superscript, space, k, g, slash, m, start superscript, 3, end superscript. to make that submarine float neutrally, and neither float nor sink in the ocean, what volume of water does that submarine need to subtract from its tanks?