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DedPeter [7]
3 years ago
10

Which expressions are equivalent to this expression?

Mathematics
2 answers:
Oxana [17]3 years ago
6 0
All expressions except D are equivalent to 4r+4
olasank [31]3 years ago
6 0
Hey

In Algebra you can add like terms but can’t add or subtract unlike terms.What this means is you can add 1a to 4a but you can’t add 1a to 4.

Think if it like this:you can add 3 cars to 4 cars but you can’t add 3 cars to 4 trucks OK?

So for A we can add the terms and find we have an anwer if 4Runner+4.
For 2 to multiply out the brackets you must multiply the term before the bracket with the term in the brackets.
So you have to multiply 2 with 2r and 2 with 2. Which gets us 4R +4.
For 3 same thing add them to get 4R +4.

But for D. When you multiply out the brackets you get 4R+16.

So the answer is A,B,C
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The graph below shows the distance, y, in miles, of a bird from its nest for a certain amount of time, x, in minutes:
Montano1993 [528]

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0.2 miles per minute represents the speed of the bird and 3 miles represents the original distance of the bird from its nest.

Step-by-step explanation:

As there is no graph mentioned here but the information are quite sufficient to answer the question.

We have points (0,3), (5,4),(10,5)...

From these points we can find the slope of the line .

From point slope formula y-y_1=m(x-x_1)

And assigning (x,y) (0,3) and (x_1,y_1) (5,4)

m=\frac{y_1-y}{x_1-x} =\frac{4-3}{5-0} =\frac{1}{5}=0.2

This slope is also the speed of the bird which is 0.2\ miles\ per\ minute.

As by plugging the values of any coordinate point we can confirm this.

Lets put (10,5), y-axis is the distance so in 10 minutes the the distance covered by the bird must be equal to to y-axis value which is 5 miles.

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So the correct choices are:B and D

The birds speed is 0.2\ miles per minute and is 3\ miles away from its nest.

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