what is the application of chemistry​

Work out the area of this circle.Give your answer in terms ofand state its units.units:Submit ANSWEI6 mmPlss help due in very soon Use a half angle identity to find the exact value of tan 5pi/12a. 2+squared3/2b. 2-squared3/2C.2+squared 3D.2-squared3. Please select the best answer from the choices provided que contiene el condn? Find the values of x and y from the following equal ordered pairs. a) (x,-2) = (4,y) b) (3x, 4) = (6, 2y) c) (2x-1, y + 2) = (-1,2) d) (2x + 4, y + 5) = (3x + 3,6) e) (x + y,y + 3) = (6, 2y) f) (x + y, x - y) - (8,0) The Cougar Swim Club acquired some Speedo Fastskin bodysuits and decided to test them out. A number of the club's fastest swimmers performed a 50m freestyle swim in a regular spandex bodysuit and in a Speedo Fastskin suit. The table below summarizes their times in seconds.Swimmer SpandexSpeedo Fastskin1 31.1 29.12 28.9 30.43 31.4 32.04 34.9 31.75 27.7 28.26 36.7 32.97 33.3 28.68 30.8 26.2Perform a t-test for dependent means to determine if there is a difference between the regular spandex suit and the Fastskin bodysuit in terms of performance.t = _____df = _____Critical value of t = _____ (use alpha = 0.05)Would you reject the null hypothesis? A tire is filled with air at 22oC to a gauge pressure of 240 kPa. After driving for some time, if the temperature of air inside the tire is 45oC, what fraction of the original volume of air must be removed to maintain the pressure at 240 kPa? State of high development of some countries is a cause of the under development of others. Discuss A student claimed that thermometers are useless because athermometer always registers its own temperature. How would yourespond?[ (Will mark brainliest!!!) 20 PTS !!Sixty percent of all children in a school do not have cavities. The probability, rounded to four decimal places, that in a random sample of 9 children selected from this school, at least 6 do not have cavities is: What should you substitute for y in the bottom equation to solve the system by the substitution method?A. y=3x+15B. y =-x-5C. y=x+5D. y=-3-15 Which inequality matches the graph?X, Y graph. X range is negative 10 to 10, and y range is negative 10 to 10. Dotted line on graph has positive slope and runs through negative 3, negative 8 and 1, negative 2 and 9, 10. Above line is shaded. 2x + 3y > 7 2x + 3y < 7 3x + 2y > 7 3x 2y < 7 Every 24 hours, Earth makes a full rotation around its axis. Earth's speed of rotation at the equator is 1.670 km per hour. What is thecircumference of Earth's equator?(Hint. Earth's circumference at the equator is equal to the distance that Earth rotates around the equator). Solve by graphing. Round each answer to the nearest tenth.6x2 = 19x 15a: 2, 1.7b: 1.7, 1.5c: 1.5, 1.5d: 1.5, 1.7 Splish Brothers Inc. reported net income of $394000 for the year. During the year, accounts receivable increased by $29000, accounts payable decreased by $12000 and depreciation expense of $61000 was recorded. Net cash provided by operating activities for the year is If f(a) is an exponential function where f(-3) = 18 and f(1) = 59, then find thevalue of f(0), to the nearest hundredth. write an imaginary conversation between nelson mandela and anne frank. imagine that Nelson Mandela and Anne Frank meet in the afterlife to talk about the extraordinary ordeals in their lives. Think and plan what they would talk about and what common or different views they would have. help plsss1/2x^2 =2If x1 and x2 are the solutions to the equation above,what is the value of x1 + x2?A) 0B) 1C) 2D) 4 Please help with (ii). thank you!!! what role does a school play to stop instellaetual migration? explain? O A. y = (x + 3)2 + 5O B. y= (x - 5)2 + 3O c. y = (x + 3)2-5O D. X=-3(y + 5)2