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nikitadnepr [17]
3 years ago
13

Plz help me I been on these for like an hour

Mathematics
2 answers:
7nadin3 [17]3 years ago
8 0

To solve this problem, the first thing we should do is eliminate the parentheses in the expression.  To do this, we must understand that subtraction of a negative equals a positive, meaning that we can get rid of the second set of parentheses and change the minus a negative to a plus sign.  If we do this, we get:

(-13w² + 13) + 2w²

Next, we can get rid of the parentheses around the first two terms because there is addition inside and outside of the parentheses.  Since there ins no multiplication or negatives, we can simply rewrite the same expression with no parentheses.

-13w² + 13 + 2w²

Now, we must combine like terms.  This means adding terms that have the same variable to the same degree.  in this case, we must add -13w² and 2w².  To do this, we simply add their coefficients, giving us:

-11w² + 13

Therefore, the expression directly above is your answer.

Hope this helps!


Rus_ich [418]3 years ago
5 0

First, keep in mind that two negatives make a positive:

-13w^2 + 13 + 2w^2

-11w^2 + 13

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Carols pencil is 18 centimeters long.how many millimrters long is the pencil.
d1i1m1o1n [39]
Each centimeter is made up of 10 mm. Multiply 18 by 10 and you'll get your answer.

18 \times 10 = 180mm
8 0
3 years ago
A radius of a circle is 14 cm and a chord has 18 cm. What is the distance between the center of the circle and the chord
ryzh [129]

Answer: 10.72\ cm

Step-by-step explanation:

Given

Radius of circle r=14\ cm

Length of chord is l=18\ cm

Suppose the distance between the chord and center is x

From figure, we can write

\Rightarrow r^2=x^2+9^2\\\Rightarrow 14^2=x^2+9^2\\\Rightarrow x^2=196-81\\\Rightarrow x^2=115\\\Rightarrow x=\sqrt{115}\\\Rightarrow x=10.72\ cm

6 0
3 years ago
2. Explain and correct the error made by a student who simplified this expression.
Ira Lisetskai [31]

Answer:

what this student did was distribute the x to all 3 numbers when what they should have done was just combine 7x and -2x, and the answer should be 5x +8

Step-by-step explanation:

By the student placing x on the outside they are making the equation seem as if 8 also had an x. However if we look at the original problem 8 does not have any variable so right away that was their first mistake. Instead they had to find the numbers that had similar values. In this case it is negative 2x and 7x. We combine those two to get 5x+8 we cannot combine these two because as said previously 8 doesnt have a variable. so the answer stays with the expression 5x+8

6 0
3 years ago
Brittany is making hair bows to sell at a craft show. Each hair bow requires 34 yard of ribbon. Brittany plans to make 50 bows.
Anna007 [38]

Answer:

37 1/2 yards

Explanation:

3/4 as a decimal is .75 so if you multiply 50 by .75 you'll end up with the answer of 37 1/2 yards.

4 0
3 years ago
Read 2 more answers
Please help fast!!!!! 20 points
FromTheMoon [43]

Answer:

I think the answer is B.7070-(-7460)

I'm sorry if it was wrong..

4 0
3 years ago
Read 2 more answers
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