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3 years ago

18 is 60% of what number

Mathematics

2 answers:

LuckyWell [14K]3 years ago

3 0

Let n be the number 18=60% of n
18=0.6n
18/0.6=n
30=n

Sonbull [250]3 years ago

3 0

18/n = 60%/100% 
18/n = 3/5 
Cross Multiply Then Divide... 

18*5/3 = n 
to get n = 30 

You could find out 1% = 18 ÷ 60 = 0.3 
100% = 100 x 1% = 100 x 0.3 = 30 

the answer is 30

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3 years ago

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$y=-\dfrac{13}{49}x^2$

Step-by-step explanation:

The shape of an arch corresponds to a parabola.

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we've already found c = 0, let's use substitute it to other equations.

$49a-7b+c=-13\quad\Rightarrow\quad49a-7b=-13$

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$\quad\quad49a-7b=-13\\+\quad49a+7b=-13$

------------------------------

$\quad\quad 98a=-26$

$\quad\quad a=-\dfrac{13}{49}$

Now we can plug this value of a in any of the two equations.

$49a-7b=-13$

$49\left(-\dfrac{13}{49}\right)-7b=-13$

$-13-7b=-13$

$-7b=0$

$b=0$

We have the values of a,b, and c. We can plug them in the general equation to find the equation of the arch.

$y=\left(-\dfrac{13}{49}\right)x^2+0x+0$

$y=-\dfrac{13}{49}x^2$

$49y=-13x^2$

This our equation of the arch!

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