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4. When a key on piano is pressed, a sound is heard. What produces this sound?A. the vibrating key of the pianoB.The Vibrating String Of PianoC. the finger pressing the piano keyD. the air molecules inside the piano Pls help Ill brainlest ASAP Solvex2- 4x=21 using the zero product property. Anyone can solve this for me thx Given b=4, c=1, A=120 for a triangle with sides a, b, c and angles A, B, C. What is the area of the triangle? Round to the nearest hundredth. Add coefficients to balance the equation to make water.H2(g) +O2 (g)H20 (1) Enter the values for the highlighted variables tocomplete the steps to find the sum:azb =3x 9+2x - 6 6 - 2xCEd =3 x9+2x-6 al 2x-6)3x b.+2x-6 2x - 63 2x-6d{x - e)f(x-3)= 9e =f=IIIg=DONE Which of the following was NOT a cause of the Cold War between the UnitedStates and the Soviet Union? *A. The U.S. was capitalist while the Soviet Union was communistB. U.S. secrecy about the Atom BombC. The Soviets refusal to allow free election in Eastern Europe after WWII.D. The Japanese attack on Pearl Harbor I went to............church to observe it's architecture.(a,an,the) PLEASE HELP THANK YOU BRANLIEST IS PROVIDED Helpppp chile. Im stuck sidnfifnfig vkfniffnf susan has a total of 31 books. amy has four less than seven times the number of books compared to susan. write an equation for this situation. help me pass this test my last day of school is may 26 if you dont mind I have more questions :) explain the merits and dement's of the political map How does scout react to the people in the gallery of the courtroom standing? Find the value of x.l ABC Company rents its extra office space to XYZ Company for $600 per month. On November 1, 2020, ABC Company received $3,600 rent in advance from XYZ Company for the months of November 2020, December 2020, January 2021, February 2021, March 2021, and April 2021. The adjusting entry on December 31, 2020 (the end of the fiscal year) would include: please help will give brainliest instantly. PLESE HELP WILL GIVE BRAINLYESTYImagine that you are Andreas Vesalius. Write a short autobiographical statement that talks about who you are, where youre from, and some of your important contributions. From this diagram of fossils (sorry its a bit blurry) which layer is the youngest and which layer is the oldest? How do you know?