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3 years ago

Please help, multiple choice

Mathematics

2 answers:

Mrrafil [7]3 years ago

7 0

Answer:

Step-by-step explanation:

5 x = x 20

Hence,

x ⋅ x = 20 ⋅ 5 x 2 = 100

x = 10

ycow [4]3 years ago

6 0

Answer:

10

Step-by-step explanation:

5x = x20

x · x = 20 · 5

x2 = 100

x = 10

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A bridge in the shape of an arch connects two cities separated by a river. The two ends of the bridge are located at (–7, –13) a

sdas [7]

Answer:

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

Step-by-step explanation:

The shape of an arch corresponds to a parabola.

the general equation for a parabola is:

$y=ax^2+bx+c$

we're given three coordinates: (-7,-13),(7,-13) and (0,0)

so we can plug these values in the general equation to make 3 separate equations:

(x,y) = (-7,-13)

$-13=a(-7)^2+b(-7)+c$

$49a-7b+c=-13$

(x,y) = (7,-13)

$-13=a(7)^2+b(7)+c$

$49a+7b+c=-13$

(x,y) = (0,0)

$0=a(0)^2+b(7)+c$

$c=0$

so we have three equations. and we can solve them simultaneously to find the values of a,b, and c.

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

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

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

we can solve these two equation using the elimination method, by simply adding the two equations

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

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

$\quad\quad 98a=-26$

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

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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3 years ago

F(x) = x2. What is g(x)?

ahrayia [7]

Answer:

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Step-by-step explanation:

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3 years ago

What is the solution to the equation?

monitta

Answer:

It B. X=12

Step-by-step explanation:

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3 years ago

Simplify: 1.3 + (–6) + (–4.25)

Dmitrij [34]

Answer:

-8.95

Step-by-step explanation:

1.3 - 6 - 4.25

-4.7 - 4.25

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Hope this helps!

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3 years ago

I need to know if a is right and answers to b and c

xxTIMURxx [149]

Answer:

Your answer is A. my Good sir

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Step-by-step explanation:

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3 years ago