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3 years ago

Solve 21= -16+n can anyone please help

Mathematics

2 answers:

Mandarinka [93]3 years ago

5 0

It is 37 = n because u just have to add 16 to 21. Basic algebra

mestny [16]3 years ago

3 0

N = 7 is the answerHope this helps

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Tickets for a family of 6 to go skiing cost $48. whats the unit price ?

Molodets [167]

The unit price would be $8.

48/6 = 8

4 0

3 years ago

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!

5 0

3 years ago

8. Write an equation for the graph in slope-

MrMuchimi

Answer:

The answer is D

Step-by-step explanation:

the y is +10

slope is -1/3

8 0

3 years ago

How can i find values if h(-4) h(x)=1/2x-1???

anzhelika [568]

plug in -4 in for x. then solve.

h(-4)=1/2(-4)-1

h(-4)= -3

6 0

3 years ago

Please help if know the answers

klio [65]

Answer:

2x-3

x =3 /2

and second one is -y+2

= -2/1

-2

6 0

3 years ago