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Stells [14]
3 years ago
7

I have no idea what this is

Mathematics
1 answer:
Julli [10]3 years ago
6 0

Answer:

23

Step-by-step explanation:

2x+14+x+7=90, 3x+21=90,3x=90-21. 3x=69, x=23

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Crystal's sister Melanie is 3 years older than twice her age. Write an algebraic expression that represents the relationship of
maksim [4K]

Answer:

M=3+2C

Step-by-step explanation:

Let M be Melanie's age

Let C be Crystal's age

Twice Crystal's age =2C

3 years more than twice crystal's age =3+2C

Therefore, the expression would be ;

M=3 +2C

4 0
3 years ago
Find the x !<br> please hurry! Thank you!
wolverine [178]

Step-by-step explanation:

2x+98=180° (angles in straight line )

2x=180-98

x=2/2

x=1

6 0
2 years ago
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How can i solve by completing the square 4r^2-28r=-49
Natalija [7]
To complete the square, the second degree term must have a coefficient of 1.
Since the second degree term here has a coefficient of 4, we start by dividing each term on both sides by 4.

4r^2 - 28r = -49

\dfrac{4r^2}{4} - \dfrac{28}{4}r = -\dfrac{49}{4}

r^2 - 7r = -\dfrac{49}{4}

Now we can complete the square.
First, we need to find what number completes the square.
We take the coefficient of the first degree term, -7 in this case.
Divide it by 2 and square it. -7 divided by 2 is the fraction -7/2.
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We add 49/4 to both sides.

r^2 - 7r + \dfrac{49}{4} = -\dfrac{49}{4} + \dfrac{49}{4}

(r - \dfrac{7}{2})^2 = 0

r - \dfrac{7}{2} = 0

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3 0
4 years ago
Which of the following represents the factorization of the trinomial below?<br>x2 - 6x +9​
valentinak56 [21]

For this case we must factor the following expression:

x ^ 2-6x + 9

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Then, the factored expression is of the form:

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Thus, the correct option is option C.

ANswer:

Option C

3 0
3 years ago
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11111nata11111 [884]

R=\{10,15,20\}\\S=\{20,25\}\\\\R\cup S=\{10,15,20,25\}

6 0
3 years ago
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