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  1. You'll get (1+2+...+8+9)(1+2...+8+9) = (1+2+...+8+9)^2 = ((1+9)(9/2))^2 = 45^2 = 2025.

    7 Answers · Science & Mathematics · 04/11/2019

  2. ...33/4 - 2k < 2 multiply by -1 -2 < 2k - 33/4 ≤ 0 add 33/4 -2+33/4 < 2k ≤ 33/4 divide by 2 -1 + 33/8 <...

    1 Answers · Science & Mathematics · 27/10/2019

  3. ... the distance traveled by plane. We can simplify that to (5/18)b Adding that up we should get 9362 km. b + (4/9)b + (5/18)b = 9362 Multiply both...

    6 Answers · Science & Mathematics · 06/11/2019

  4. ...11y +6 Notice that the coefficients of the odd exponents add to 12 as do the coefficients of the even exponents. Let...

    3 Answers · Science & Mathematics · 27/10/2019

  5. 2π(r₁ + r₂) = 12π cm π(r₁² + r₂²) = 20π cm² 2(r₁ + r₂) = 12 r₂ = 6-r₁ r₂² = 36-12r₁ + r₁² r₁² + r₂² = 20 r₁² + 36 - 12r₁ + r₁² = 20...

    3 Answers · Science & Mathematics · 01/11/2019

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