Explain how an electric transformer changes the voltage of the electric current. Why does a transformer work only with alternating current?

An instructor asks students to rate their anxiety level on a scale of 1 to 100 (1 being low anxiety and 100 being high anxiety) just before the students take their final exam. The responses are shown below. Construct a relative frequency table for the instructor using five classes. Use the minimum value from the data set as the lower class limit for the first row, and use the lowest possible whole-number class width that will allow the table to account for all of the responses. Use integers or decimals for all answers.48,50,71,58,56,55,53,70,63,74,64,33,34,39,49,60,65,84,54,58Provide your answer below:Lower Class Limit Upper Class Limit Relative Frequency a)Al usar un microscopio el microscopio se ampla una clula 400 veces. Escribe el factor de ampliacin como cociente o como escala.b)La imagen de una clula usando dicho microscopio mide 1,5 mm Cunto mide la clula en la realidad? Which of the following describes what happens in a chemical reaction?O A. Molecules change from one phase to another.B. Molecules dissolved in solution are separated again.O c. Chemical bonds are broken, and new ones are formed.O D. Molecules mix without rearranging atoms. 9. The U.S. has 10 million miles of road.A. O TrueB. O False Mateo is designing a technical diagram that many textbook publishers can use, and he wants to make sure he retains the rights to the diagram before selling it. At what stage does a copyright for his creative work come into effect? Which details would provide helpful factual support forthis statement? Check all that applydescribing the geographic location of Chinaproviding information about the level of populationgrowthnaming growing industries in Chinaproviding information about why coal causespollutiongiving data about air pollution caused by coalburned as fuel The width of a casing for a door is normally distributed with a mean of 24 inches and a standard deviation of 1/8 inch. The width of a door is normally distributed with a mean of 23 7/8 inches and a standard deviation of 1/16 inch. Assume independence. a. Determine the mean and standard deviation of the difference between the width of the casing and the width of the door. b. What is the probability that the width of the casing minus the width of the door exceeds 1/4 inch? c. What is the probability that the door does not fit in the casing? During the Zoroastrian purification ceremony which items does a child receive Need Help Please I'm Out Of Time ;( Which of the following questions are statistical questions? Select all that apply How far does Mary live from school? How many students were absent from Mrs. Jenssen's class today? How tall are the sixth-grade students in your school? How many pull-ups can each student in your class do? What was the temperature at 4 p.m. each day this week? Simplify (4n^4 - 3n^2 + n)+ (2n^4 -7n^2 + 9n). Express your answer without factoring. Help fast will mark you the brainlest [!] Urgent [!] Find the domain of the graphed function. Find each difference.(32mn2 + 50mn2) - (10mn2 - 16m2 + 64) PLEASE HELP!!! ASAP!!! Femur Co. acquired 70% of the voting common stock of Harbor Corp. on January 1, 2020. During 2020, Harbor had revenues of $2,500,000 and expenses of $2,000,000. The amortization of fair value allocations totaled $60,000 in 2020. Not including its investment in Harbor, Femur Co. had its own revenues of $4,500,000 and expenses of $3,000,000 for the year 2020. The noncontrolling interest's share of the earnings of Harbor Corp. for 2020 is calculated to be The problem is: On a Map, 3 inches represents 40 miles, How many inches represents 480 miles? difference between plant and animal cyanide resistance respiration. Find the length and width of a rectangle that has the given perimeter and a maximum area. Perimeter: 116 meters Monique is researching local recycling.What is the best action to take if she faces challenges while locating sources?A.She should ask a fellow student.B.She should question her neighbors.C.She should consult a teacher or librarian.D.She should talk to her parents or grandparents. Which of the following is NOT an indicator of a chemicalreaction?O A. Breaking into small piecesOB. Producing a solidOC. Changing colorOD. Producing light In a survey, 205 people indicated they prefer cats, 160 indicated they prefer dots, and 40 indicated they dont enjoy either pet. Find the probability that if a person is chosen at random, they prefer cats