The number of boys is 3/5 of the number of girls. If there are 120 children all together, how many boys are there? PLEASE HELP M
2 answers:
Answer:
There are 45 boys.
Step-by-step explanation:
The best way to easily solvethis is by making equations, see below.
Now we can subtract the secons equation from the first.
I'm also goong to multiply the equatipn by 5 to remove the fraction.
Now simplify
Now we found out there are 75 girls. Now we insert this into our second equation to find how many boys there are.
Now we know there are 45 boys.
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Answer:
(a)
(b) Domain: <em>(See attachment for graph)</em>
(c)
Step-by-step explanation:
Given
Solving (a): A function; l in terms of w
All we need to do is make l the subject in
Divide through by 2
Subtract w from both sides
Reorder
Solving (b): The graph
In (a), we have:
Since l and w are the dimensions of the fence, they can't be less than 1
So, the domain of the function can be
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To check this
When
When
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<em>See attachment for graph</em>
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Solving (c): Write l as a function
In (a), we have:
Writing l as a function, we have:
Substitute for l in
becomes
