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Zanzabum
3 years ago
14

THIS NOT A QUESTION THAT NEED A ANSWER, THIS IS FOR FUTURE PEOPLE WHO MIGHT NEED IT>3

Mathematics
2 answers:
Y_Kistochka [10]3 years ago
4 0

Answer:

thx

Step-by-step explanation:

alexira [117]3 years ago
3 0

Answer:

15

Step-by-step explanation:

70-10=60

60/4=15

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4) If you bought a jersey at 30% off and paid $205.50,<br> how much money did you save?
NemiM [27]

Answer:

$267.15‬

Step-by-step explanation:

The way my math teacher showed me to do it is take the price you paid and multiply it by 1.x (x being the amount of the discount).  

In doing that, $205.50 multiplied by 1.30 is $267.15‬ and the original price of the jersey.

Hope this helps :)

6 0
3 years ago
A level maths factor theorem <br>help in part (b) please​
Rina8888 [55]

Given polynomial f(x)=4 x^{3}-12 x^{2}+2 x-6.

(a) To show that (x – 3) is a factor of f(x).

Factor theorem:

<em>A polynomial f(x) has a factor of (x – a), if and only if f(a) = 0.</em>

f(x)=4 x^{3}-12 x^{2}+2 x-6

f(3)=4 (3)^{3}-12 (3)^{2}+2 (3)-6

       =4(27)-12(9)+6-6

       =108-108

       = 0

f(3) = 0

Hence (x – 3) is a factor of f(x).

(b) f(x)=0

4 x^{3}-12 x^{2}+2 x-6=0

Here 4x^2 is common in first 2 terms and 2 is common in next 2 terms.

4x^2(x-3 )+2 (x-3)=0

Now, (x – 3) is common in both terms.

(x-3)(4x^2+2)=0

(x-3)=0 and (4x^2+2)=0

x = 3 and 4x^2+2=0

3 is the real root.

using quadratic formula solve 4x^2+2=0 and find the other roots.

$x=\frac{-b \pm \sqrt{b^{2}-4 a c}}{2 a}

$x=\frac{-0 \pm \sqrt{0^{2}-4 (4) (2)}}{2 (4)}

$x=\pm\frac{\sqrt{-32}}{8}

$x=\pm\frac{4\sqrt{2}i}{8}

$x=\pm\frac{\sqrt{2}i}{2}

These are complex roots.

Hence 3 is the only real root of the equation f(x) = 0.

8 0
4 years ago
Read 2 more answers
Lauren says that -3.5 is greater than -3 1/3. Do you agree? Explain.
kirza4 [7]

Answer:

-3\frac{1}{2}

Step-by-step explanation:

-3.5 means -(3 + \frac{1}{2})

In other words, -3.5 = -3\frac{1}{2}

When we draw two numbers -3\frac{1}{3} and -3\frac{1}{2} on a number line, -3\frac{1}{2} comes first from left to right.

We know that all the numbers on a number line from left to right are in increasing order.

Therefore, -3\frac{1}{2} is smaller than -3\frac{1}{3}.

-3\frac{1}{2}

Lauren is not correct.

3 0
3 years ago
The area of a compact disc is 78.53 square centimeters. What is the radius of the disc? Use pi = 3.14
Tom [10]

Answer:

r = 5 cm

Step-by-step explanation:

A = πr²

78.53 = (3.14)r²

divide by 3.14

25 = r²

r = ±5

r = 5

5 0
3 years ago
Please help will Mark brainiest and please show your working out thanks
AlekseyPX

Step-by-step explanation:

800ml \times  \frac{1}{4}  = 200ml \\ 200ml -  -  > 1800ml \\ 360ml -  -  -  > x \\  \frac{200}{360}  = \frac{1800}{x}  \\ x =  \frac{18}{2}  \times 360  \\  \:  \:  = 9 \times 360 \\  = 3240ml \\  = 3.24l

6 0
3 years ago
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