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Atrain crosses a telegraph pole in 10sec. and a bridge with 255m long in 25sec find the length and speed of the train​

Answers

  • Réponse publiée par: brianneaudreyvuy

    Length = (3a–5)cm

    Perimeter = (16a–12)cm

    Step-by-step explanation:

    Area = Length x Width

    (15a²–28a+5)cm² = (5a-1)cm x Length

    Length = (15a²–28a+5)cm / (5a-1)

    = (5a–1)(3a–5)cm / (5a-1)

    Length = (3a–5)cm

    Perimeter = Sum of the polygon's sides' measures

    = Length + Width + Length + Width

    = 2(Length + Width)

    = 2[ (3a–5)cm + (5a-1)cm ]

    = 2[ 3acm–5cm+5acm–cm ]

    = 2[ 8acm–6cm ]

    = 2[ 8a–6 ] cm

    Perimeter = (16a–12)cm

  • Réponse publiée par: mildredjingpacpavhvg

    answer:

    tik tok kanalang

    Step-by-step explanation:

    Or mL nalang


    Four times the square of a number is 15 more than seven times the number. What is the number?

Give
  • Réponse publiée par: saintjohn

    Step-by-step explanation:

    W = 5a + 1

    Area = LW = 15a² + 28a + 5 cm

    Missing: Length

    Solution:

    Factor the area

    (5a + 1)(3a + 5)

    Since W = 5a + 1;

    Length must be = 3a + 5

    Perimeter = 2L + 2W

    = 2(3a+5) + 2(5a+1)

    = 6a + 10 + 10a + 2

    = 16a + 12

    Length = 3a + 5 cm

    Perimeter = 16a + 12 cm

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Atrain crosses a telegraph pole in 10sec. and a bridge with 255m long in 25sec find the length and s...