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3 years ago

- 7th Grade Work - Please answer if it's either a, b, c, or d Please help ; - ;

Mathematics

2 answers:

Kamila [148]3 years ago

8 0

Answer: A

Explanation: if you combine like terms (first do the x’s, so 7x, 9x, 9x)
7x + 9x + 9x
25
(Then you combine the second like terms, -3, -3, -4)
-3 - 3 - 4
-10

Therefore your answer is 25x - 10

dexar [7]3 years ago

6 0

Answer:

ans-a 25x - 10

Step-by-step explanation:

7x+9x+9x = 25x

-3-3-4 = -10

so, 25x-10.

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3 years ago

Determine which point is the solution to the given system.

KatRina [158]

Answer:

Step-by-step explanation:

We equate both the y's and solve for x algebraically:

$-\frac{4}{7}x+16=-\frac{2}{7}x+12\\16-12=-\frac{2}{7}x+\frac{4}{7}x\\4=\frac{2}{7}x\\x=\frac{4}{\frac{2}{7}}\\x=14$

Now taking the value x= 14 and putting it in the 1st equation would give us y:

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4 years ago

23 degrees below 0, what is the answer please help

IrinaVladis [17]

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-23

Step-by-step explanation:

23 degrees below 0 is 0-23, or -23

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3 years ago

Read 2 more answers

What is the mode of the data shown below?

aev [14]

C
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2 years ago

The sum of three consecutive terms in an arithmetic sequence is 27, and their product is 585. find the three terms.

sammy [17]

$\text{the three consecutive terms in an arithmetic sequence}\\a;\ a+d;\ a+2d\\\\\text{system of equals}\\\\ \left\{\begin{array}{ccc}a+a+d+a+2d=27\\a(a+d)(a+2d)=585\end{array}\right\\ \left\{\begin{array}{ccc}3a+3d=27&|:3\\a(a+d)(a+2d)=585\end{array}\right\\ \left\{\begin{array}{ccc}a+d=9&\to d=9-a\\a(a+d)(a+2d)=585\end{array}\right\\$
$\text{substitute to the second equation}\\\\a(a+9-a)(a+2(9-a))=585\\\\a(9)(a+18-2a)=585\\9a(18-a)=585\ \ \ |:9\\a(18-a)=65\\18a-a^2=65\ \ \ |\text{change the signs}\\a^2-18a=-65\\a^2-2a\cdot9=-65\ \ \ |+9^2\\\underbrace{a^2-2a\cdot9+9^2}_{(a-b)^2=a^2-2ab+b^2}=-65+9^2\\(a-9)^2=16\to a-9\pm\sqrt{16}\\a-9=-4\ \vee\ a-9=4\ \ \ |+9\\a=5\ \vee\ a=13\\\\d=9-5=4\ \vee\ d=9-13=-4$
$Answer:\ a=5;\ a+d=9; a+2d=13\ vee\ a=13;\ a+d=9;\ a+2d=5$

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4 years ago