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2 years ago

Can anyone help me please and if you can, can you do it on paper and then upload the picture pls

Mathematics

2 answers:

ehidna [41]2 years ago

5 0

Answer:

a = 7

Step-by-step explanation:

8a - 4 = 3 + 7a export like terms to the same side of the equation

8a - 7a = 3 + 4 add like terms (the expressions will change sign when exported like when it's a negative expression it will be positive and vice versa.)

a = 7

Bezzdna [24]2 years ago

4 0

The correct answer is “a = 7”

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4. Write three ratios equivalent to<br> 2:5

babymother [125]

Answer:

4:10, 8:20, 16:40

Step-by-step explanation:

Times both numbers by 2 each time to get a new equivalent ratio.

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3 years ago

If 4x−3=2x+9, then x= ?

son4ous [18]

Answer:

$4x - 2x = 9 + 3$

$2x = 12$

$x = \frac{12}{2}$

$x = 6$

Hope it helps u mate

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4 years ago

Read 2 more answers

2. (04.02 MC)

k0ka [10]

Answer:

The origin is (0,0) and to plot the points go over on the sideways line (right for positive numbers and left for negative numbers). Crawl over the sideways line and up the up and down line. For negative numbers on the up and down line go down, but for positive go up.

Step-by-step explanation:

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3 years ago

how many gallons of 80% antifreeze solution must be mixed with 100 gallons of 10% antifreeze to get a mixture that is 70% antifr

ololo11 [35]

Let's say we'll mix "x" amount of the 80% solution, how much antifreeze is in it? well is just 80% of antifreeze, and the rest is something else.... what's 80% of "x"? so is (80/100)*x, or 0.8x.

likewise, the mixture will be a 70% solution, and let's say it adds up to "y" amount, so how much antifreeze is in it? well (70/100) * y or 0.7y.

$\bf \begin{array}{lccclll}
&\stackrel{gallons}{amount}&\stackrel{\%}{quantity}&\stackrel{antifreeze}{quantity}\\
&------&------&------\\
\textit{80\% sol'n}&x&0.80&0.8x\\
\textit{10\% sol'n}&100&0.10&10\\
------&------&------&------\\
mixture&y&0.70&0.7y
\end{array}$

so whatever "x" is, we know that x + 100 = y.

and we know that 0.8x + 10 = 0.7y.

$\bf \begin{cases}
x+100=\boxed{y}\\
0.8x+10=0.7y\\
----------\\
0.8x+10=0.7\left( \boxed{x+100} \right)
\end{cases}
\\\\\\
0.8x+10=0.7x+70\implies 0.8x-0.7x=70-10\implies 0.1x=60
\\\\\\
x=\cfrac{60}{0.1}\implies x=600$

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3 years ago

A fair number cube is labeled with the numbers 1-6. After rolling the cube 90 times, how

klasskru [66]

Answer:

250 times

This is because a number die is random and if it were based on even and odd, the chances would be 50/50

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3 years ago