Help with these?

avaj

New member
Joined
Jan 27, 2021
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1
Hello, I am struggling on numbers 1-5 oScreen Shot 2021-01-27 at 10.54.29 PM.pngn this Ignore my writing, thanks.
 
You need to read READ BEFORE POSTING

It will tell you that we dislike multiple questions per thread

It will also tell you that we help you find answers, but do not give answers.

It also suggests that you tell us a bit about where you are in your studies. I am guessing that you may be studying quadratic equations. Is that correct?

Finally, we greatly prefer to see what work you have done so that we can see exactly where you need help.

However, you have shown some work for problem 1.

You are correct that L = 2w + 4. Well done.

And presumably you know that the formula for the area of a rectangle is A = L * w.

And finally you need to know that if you have three unknowns you need three equations.

[MATH]A = 70.[/MATH]
[MATH]A = L * w.[/MATH]
[MATH]L = 2w + 4.[/MATH]
Do you see where those came from?

[MATH]\text {Therefore, }70 = L * w = (2w + 4) * w \implies[/MATH]
[MATH]2w^2 + 4w = 70.[/MATH]
Do you understand that?

Now what?
 
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