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Evgen [1.6K]
3 years ago
8

Pls help me ASAP!! Which expression represents "subtract a number, n, from 10 then multiply by nine cubed"?

Mathematics
1 answer:
Ksivusya [100]3 years ago
5 0
The answer would be:  "  (10 <span>− n) </span>×  9³  " .
_______________________________________________________
     If there are specific answer choices from which to choose, please comment and to let me know, and I can provide a "specific" answer.
_______________________________________________________
    Hope this helps!
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I need help now plz​
Romashka-Z-Leto [24]

Answer:

C

Step-by-step explanation:

The picture is a bit blurry, but from what i can see, i'd say C (whichever one has -4 x 3 x 1 under the square root.)

So for this, you need to know the quadratic formula, which is:

\frac{-b ± \sqrt{b^{2} -4ac} }{2a}

<em>*ignore the weird capital A, it keeps coming up when i try to use the ± symbol</em>

They have given you the equation of a quadratic, so the first thing you have to do is rearrange it, so that x^{2} comes first.

<u>So now we have the equation: 3</u>x^{2}<u> - 2x +1</u>

*the quadratic formula uses a, b and c, but they are specific. a is always the coefficient of x^{2} , b is always the coefficient of x and c is always the constant (number without an x)

<u>So, i can find that, in this case:</u>

a = 3      b= -2    c=1

<u>Now substitute each of those values it into the original quadratic equation:</u>

<u />

\frac{-(-2) ± \sqrt{(-2)^{2} -4(3)(1)} }{2(3)}

<em>*again, ignore the weird capital A. </em>

That's how you find the answer, which from what i can tell in the picture is C.

Hope that helped : )

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3 years ago
A car travels 65 km in 45 minutes what is the average speed of the car in km/h
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the whole point is to cancel out your minutes, and leave the hours as your new unit for the denominator
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13km/9 x 60/1 hr.
780km/9hrs. 
That would be your answer. If someone can double check my math that would be fantastic.


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