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3 years ago

What is the value of 2x^2+5y-8 when x=2 and y=4

Mathematics

2 answers:

Bumek [7]3 years ago

7 0

Answer:

Any line can be graphed using two points. Select two x x values, and plug them into the equation to find the corresponding y y values.

Step-by-step explanation:

KonstantinChe [14]3 years ago

7 0

I hope you understood! :))

You might be interested in

Find a homogeneous linear differential equation with constant coefficients whose general solution is given by

frez [133]

Answer:

$y" + 2y' + 2y = 0$

Step-by-step explanation:

Given

$y=c_1e^{-x}cosx+c_2e^{-x}sinx$

Required

Determine a homogeneous linear differential equation

Rewrite the expression as:

$y=c_1e^{\alpha x}cos(\beta x)+c_2e^{\alpha x}sin(\beta x)$

Where

$\alpha = -1$ and $\beta = 1$

For a homogeneous linear differential equation, the repeated value m is given as:

$m = \alpha \± \beta i$

Substitute values for $\alpha$ and $\beta$

$m = -1 \± 1*i$

$m = -1 \± i$

Add 1 to both sides

$m +1= 1 -1 \± i$

$m +1= \± i$

Square both sides

$(m +1)^2= (\± i)^2$

$m^2 + m + m + 1 = i^2$

$m^2 + 2m + 1 = i^2$

In complex numbers:

$i^2 = -1$

So, the expression becomes:

$m^2 + 2m + 1 = -1$

Add 1 to both sides

$m^2 + 2m + 1 +1= -1+1$

$m^2 + 2m + 2= 0$

This corresponds to the homogeneous linear differential equation

$y" + 2y' + 2y = 0$

6 0

3 years ago

Troy is considering two lawn care services. Premier Landscaping charges $15 for travel to Troy's house and $55 per hour for main

Irina18 [472]

Answer:

Cost for Premier Landscaping = $55h+15$

Cost for Ace Landscaping = $65h$

Where $h$ is the number of hours spent on lawn care.

Step-by-step explanation:

Given that:

<em>Charges as per Premier Landscaping:</em>

Fixed charges for travel to the house = $15

Per hour charges = $55

Let $h$ be the number of hours for which lawn care is done.

So, Charges for $h$ hours = Per hour charges $\times$ Number of hours =$55 $h$

Therefore, total cost = $55h+15$

Charges as per Ace Landscaping:

Per hour charges = $65

Let $h$ be the number of hours for which lawn care is done.

Then Charges for $h$ hours = Per hour charges $\times$ Number of hours =$65 $h$

Therefore, system of equations that represent the lawn care services:

Cost for Premier Landscaping = $55h+15$

Cost for Ace Landscaping = $65h$

$h>0$

Where $h$ is the number of hours spent on lawn care.

8 0

3 years ago

Please help I’m going to fail

SCORPION-xisa [38]

Answer:

Step-by-step explanation:

8 0

3 years ago

Read 2 more answers

Find the area for this pls

Anit [1.1K]

Answer:

3,36 in^2

Step-by-step explanation:

The geometric shape shown in image is called a trapezoid

to calculate the area of a trapezoid we use the following formula:

1/2*(a+b)*h (a and b are bases, h: height)

bases are 1.3 and 3.5 and height is 1.4

1/2(1.3 + 3.5)*(1.4) = 3,36 the area is stated in square units so the answer is

3,36 in^2

6 0

2 years ago

The regular price of a color tv is 559.45. during a sale, hill tv is selling the tv for 457.41. Determine the percent decrease i

Lena [83]

Answer:

478

Step-by-step explanation:

559.45-457.41=102.04

102.04/559.45*100

approximately 478

5 0

4 years ago