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2 years ago

1. The perimeter of a rectangle is 30 inches. If its length is three times its width, find both

Mathematics

1 answer:

andrew11 [14]2 years ago

3 0

The length is 11.25 inches.

The width is 3.75 inches.

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2.) Is (-1, 2) a solution to this system of equations?<br> 1-x+2y = 3<br> 12x - y - 4

gizmo_the_mogwai [7]

Answer:

12x-y-4

Step-by-step explanation:

3 0

2 years ago

Para hoy xfa HAY 15 PUNTOS

neonofarm [45]

Answer:

It should be A if im not corect

Step-by-step explanation:

5 0

3 years ago

The function f(x) = 2x2 + 3x + 5, when evaluated, gives a value of 19. What is the function’s input value?

goldenfox [79]

$f(x)=\quad 2{ x }^{ 2 }+3x+5$

Let's called the input 'z'

When we plug 'z' in the function we get ;

$f(z)=\quad 2{ z }^{ 2 }+3z+5$

And we know that, this is equal to 19, so ;

$2{ z }^{ 2 }+3z+5=\quad 19$

Let's rearrange the equation.

$2{ z }^{ 2 }+3z+5=\quad 19\\ \\ 2{ z }^{ 2 }+3z=\quad 19-5\\ \\ 2{ z }^{ 2 }+3z=\quad 14\\ \\ 2{ z }^{ 2 }+3z-14=\quad 0$

So we have a quadratic equation here.

We'll use this formula to solve it :

$\frac { -b\pm \sqrt { { b }^{ 2 }-4ac } }{ 2a }$

The formula is used in equation formed like this :

$a{ x }^{ 2 }+bx+c=0$

In our equation,

a=2 , b=3 and c=-14

Let's plug in the values in the formula to solve,

$a=2\quad b=3\quad c=-14\\ \\ \frac { -3\pm \sqrt { 9-(4\cdot 2\cdot -14) } }{ 4 } \\ \\ \frac { -3\pm \sqrt { 9-(-112) } }{ 4 } \\ \\ \frac { -3\pm \sqrt { 9+112 } }{ 4 } \\ \\ \frac { -3\pm \sqrt { 121 } }{ 4 } \\ \\ \frac { -3\pm 11 }{ 4 }$

So,

$z=\quad \frac { -3+11 }{ 4 } \quad ,\quad \frac { -3-11 }{ 4 } \\ \\ z=\quad \frac { 8 }{ 4 } \quad ,\quad \frac { -14 }{ 4 } \\ \\ z=\quad 2,\quad -\frac { 7 }{ 2 }$

So the input can be both, 2 and $-\frac{7}{2}$

8 0

3 years ago

A number went into this machine and 36 came out. What number went in?

labwork [276]

Answer:

6? If its a squared machine than it is 6 bc 6 squared is 36. sorry if it is wrong.

Step-by-step explanation:

3 0

3 years ago

Read 2 more answers

Pls help me I will make you as brain plsss

Jlenok [28]

Answer:

D I assume, the picture is quite blurry so my apologies.

Step-by-step explanation:

6 0

3 years ago