A varies jointly as b and c. Find when b = 7 and c = 9, if the constant is the variation is 3. A) 189 B) 7/3 <

Question

A varies jointly as b and c. Find when b = 7 and c = 9, if the constant is the variation is 3.

A) 189

B) 7/3

C) 21

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2022-04-08T04:46:10+00:00 0 Answers 0

Answers ( 2 )

  1. Sophia
    0
    2022-04-08T04:47:40+00:00

    Answer:

    Option A is correct

    Value of A is, 189

    Step-by-step explanation:

    Joint variation states:

    A varies jointly as b and c.

    u21d2[tex]A propto b[/tex] and [tex]A propto c[/tex]

    u21d2[tex]A propto bc[/tex]

    then the equation is in the form of:

    [tex]A = k cdot bc[/tex]

    where, k is the constant of variation.

    As per the statement:

    A varies jointly as b and c.

    u21d2[tex]A = k cdot bc[/tex] ….[1]

    To find A .

    Substitute the given values b = 7 , c = 9 and k = 3 in [1]

    then;

    [tex]A = 3 cdot 7 cdot 9 = 21 cdot 9 = 189[/tex]

    Therefore, the value of A is, 189

  2. Anna
    0
    2022-04-08T04:47:54+00:00

    189 would be correct!

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