Sarah is demonstraing the idea that polynomials are closed under addition. Her work and explanation are shown. Select an equation and phrases to complete the statement Part A: Add 30° +63 - 7 to Equation A 21" - (2x) + 42 Equation B (2x) + 4.4.19 Equation c ( 82)-2-(3x)" + 7 Part B: This is closed because of the sum are and the sum is a polynomial.

Martha has a deck of cards. she has lost some of the cards, and now the deck only contains nine spades, eleven diamonds, eight clubs, and twelve hearts. martha predicts that whenever she draws a card from the deck without looking, she will draw a club one-fifth of the time. which activity would best allow martha to test her prediction? a. randomly draw a card from the box and see if it is a club. b. randomly draw a card. then, continue to draw another card until all eight clubs are drawn. c. randomly draw and replace a card 120 times. then, observe how close to 30 times a club is drawn. d. randomly draw and replace a card 100 times. then, observe how close to 20 times a club is drawn.

Which equation expression the relationship between the number of boxes b and the number of cans c and the proportion is 48

What is value of x? enter your answer in the box. x =