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3 years ago

Simplify 2/3 (9x - 6) A) 3x – 2 B) 6x – 4 C) 12x – 8 D) 18x – 12

Mathematics

1 answer:

Naily [24]3 years ago

8 0

2/3 (9x - 6)

=2/3(9x) - 2/3(6)
= 6x - 4
answer
B) 6x – 4

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Solve using the quadratic formula:20\x+10\(x-10)=10\3

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steps by step solution : plz see in attachment ✌

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3 years ago

Need pre-cal help. Will mark best answer brainliest

OlgaM077 [116]

so, let's keep in mind that

$\bf \begin{array}{|c|ll} \cline{1-1} \textit{a\% of b}\\ \cline{1-1} \\ \left( \cfrac{a}{100} \right)\cdot b \\\\ \cline{1-1} \end{array}$

so let's make a quick table of those solutions, say A, B, C solutions with x,y,z liters of acid, with an acidity of 0.25, 0.40 and 0.60 respectively.

$\bf \begin{array}{lcccl} &\stackrel{solution}{quantity}&\stackrel{\textit{\% of }}{amount}&\stackrel{\textit{liters of }}{amount}\\ \cline{2-4}&\\ A&x&0.25&0.25x\\ B&y&0.40&0.4y\\ C&z&0.60&0.6z\\ \cline{2-4}&\\ mixture&78&0.45&35.1 \end{array} \\\\\\ \begin{cases} x+y+z=78\\ 0.25x+0.4y+0.6z=35.1 \end{cases}$

we know she's using "z" liters and those are 3 times as much as "y" liters, so z = 3y.

$\bf \begin{cases} x+y+3y=78\\ x+4y=78\\[-0.5em] \hrulefill\\ 0.25x+0.4y+0.6(3y)=35.1\\ 0.25x+0.4y=1.8y=35.1\\ 0.25x+2.2y=35.1 \end{cases}\implies \begin{cases} x+4y=78\\\\ 0.25x+2.2y=35.1 \end{cases} \\\\[-0.35em] \rule{34em}{0.25pt}\\\\ x+4y=78\implies \boxed{x}=78-4y \\\\\\ \stackrel{\textit{using substitution on the 2nd equation}}{0.25\left( \boxed{78-4y} \right)+2.2y=35.1}\implies 19.5-y+2.2y=35.1$

$\bf 1.2y=15.6\implies y=\cfrac{15.6}{1.2}\implies \blacktriangleright y=13 \blacktriangleleft \\\\\\ x=78-4y\implies x=78-4(13)\implies \blacktriangleright x=26 \blacktriangleleft \\\\\\ z=3y\implies z=3(13)\implies \blacktriangleright z=39 \blacktriangleleft \\\\[-0.35em] \rule{34em}{0.25pt}\\\\ ~\hfill \stackrel{25\%}{26}\qquad \stackrel{40\%}{13}\qquad \stackrel{60\%}{39}~\hfill$

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3 years ago

You work two jobs. You earn $9.45 per hour as a salesperson and $11.34 per hour stocking shelves. Your combined earnings this mo

konstantin123 [22]

Answer:

11.34x + 9.45y = 141.75

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y = -1.2x + 15

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4 years ago

4.4 + [4 • 1/4 + 8.6]

Delicious77 [7]

Answer: 4.4 + (4 x 1/4 + 8.6) = 14

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3 years ago

Twice a number is equal to negative four. Which equation could be used to find the number? 2n = 4 2n = -4n 2n - 4 2n = -4

Pepsi [2]

<span>Twice a number is equal to negative four :
2n = -4

answer
</span><span>2n = -4
last one is your answer</span>

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4 years ago

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