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a varies directly as b and c and a=90 when b=6 and c=3 find a when b=4 and c=1/2?



Sagot :

Answer:

The value of a is 5.

Step-by-step explanation:

Mathematical Equation:

[tex]\LARGE\text{$a=kbc$}[/tex]

For the constant of variation (k):

Given:   [tex]a=90[/tex],   [tex]b=6[/tex],   [tex]c=3[/tex]

Find:   [tex]k=?[/tex]

Formula:   [tex]a=kbc[/tex]

Solution:

[tex]a=kbc\\90=(6)(3)k\\90=18k\\\frac{90}{18}=\frac{18k}{18}\\\boldsymbol{5=k}[/tex]

For the value of a:

Given:   [tex]k=5[/tex],   [tex]b=4[/tex],   [tex]c=\frac{1}{2}[/tex]

Find:   [tex]a=?[/tex]

Formula:   [tex]a=kbc[/tex]

Solution:

[tex]a=kbc\\a=(5)(4)(\frac{1}{2})\\a=(5)(2)\\\boxed{\boldsymbol{10}}[/tex]

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