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steposvetlana [31]
3 years ago
11

How do i know the unknown quantity​

Mathematics
1 answer:
bonufazy [111]3 years ago
5 0

Answer:

15 cakes

Step-by-step explanation:

Cross multiply: 125(3)=25x

Simplify: 375=25x

Divide 25 on both sides: 15

Add units!

Hope it helps! Comment if you have any questions!

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How many solutions does the system of equations 5x−4y=8 and 5x−4y=2 have?
Rama09 [41]

Answer:

1 solution. y= 5/4x - 1/2

3 0
3 years ago
Which are the solutions of x2 = –7x – 8?
Yanka [14]
You can start by rewriting the equation so that the right side equals zero. Add -7x and 8 to both sides.

x^2+7x+8=0

You can now use the quadratic equation (below), where a=1, b=7, and c=8, to find solutions. Plug in these values for a, b, and c into the equation and simplify.

\frac{-b \pm \sqrt{b^2-4(ac)}} {2a}
\frac{-7 \pm \sqrt{7^2-4(1 \times 8)}} {2 \times 1}
\frac{-7 \pm \sqrt{49-32}} {2}
\frac{-7 \pm \sqrt{17}} {2}

The final answer is the combination of both solutions.
x=\frac{-7}{2} \pm \frac{\sqrt{17}} {2} \approx -3.5 \pm 2.06.

Or approximately...
x=(-3.5-2.06) \approx -5.56, (-3.5+2.06) \approx-1.44
8 0
3 years ago
Read 2 more answers
Thirty-nine thousand, seven hundred one standard form
astraxan [27]

Answer:

39,701

Step-by-step explanation:

4 0
3 years ago
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How do I completely factor 4x^2-64?
Salsk061 [2.6K]
4x^2 - 64

= 4(x + 4) (x - 4)


4 0
3 years ago
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N Mark's class, there are 15 students with brown hair, 3 students with blonde hair, and 5 students with black hair.
fiasKO [112]

Answer:

3:1

Step-by-step explanation:

brown:black

15:5

Divide both sides by five;

15/5 :5/5

= 3:1

7 0
2 years ago
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