ANSWER All OF THESE QUESTION FOR BRAIN WHO WILL ANSWER FIRST? LETS SEE!!!!!!!!!!

Mathematics

1 answer:

zysi [14]2 years ago

7 0

B.
D.
B.
D.
B.
I've literally been working on these in school lolz

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Svetllana [295]

1 yd = 3 ft

This means the unit cost per feet is $4.99/3.

Let 'x' represent the length of the material in feet that you can be with $30.

(4.99/3)*x <= 30

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Carbon has a half life of 5730 years. How much carbon would be left after 3 half life's with 56 grams

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Step-by-step explanation:

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3 years ago

I don’t understand this one

Masja [62]

Answer:

see below

Step-by-step explanation:

Put -1 where x is in each expression and evaluate it.

You will find that the expression is zero when the numerator is zero. And you will find the numerator is zero when it has a factor that is equivalent to ...

(x +1)

Substituting x=-1 into this factor makes it be ...

(-1 +1) = 0

Evaluating the first expression, we have ...

$\dfrac{4(x+1)}{(4x+5)}=\dfrac{4(-1+1)}{4(-1)+5}=\dfrac{4\cdot 0}{1}=0$

This first expression is one you want to "check."

You can see that the reason the expression is zero is that x+1 has a sum of zero. You can look for that same sum in the other expressions. (The tricky one is the one with the factor (x -(-1)). You know, of course, that -(-1) = +1.)