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Tems11 [23]
2 years ago
7

URGENT. Q) 18, 19, 20

Mathematics
2 answers:
notsponge [240]2 years ago
4 0
18. s = 5r^2 + 7......making r the subject
      s - 7 = 5r^2
      (s - 7) / 5 = r^2...by taking the sqrt of both sides, it eliminates the ^2
     ( sqrt (s-7)/5) = r

19. h = ut - 1/2gt^2....u = 100, t = 1 4/5(or 9/5)...g = 6.4
      h = (100)(9/5) - 1/2(6.4)(9/5^2)
      h = 180 - 1/2(6.4)(3.24)
      h = 180 - 3.2(3.24)
      h = 180 - 10.368
      h = 169.632 or 169 79/125

20. sorry..do not know this one
vazorg [7]2 years ago
4 0
X= 0.2222 and so on hope I was helpful
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2 years ago
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3 years ago
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8 0
2 years ago
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kirill115 [55]

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Step-by-step explanation:

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