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3 years ago

HELP PLZ!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Mathematics

2 answers:

Maurinko [17]3 years ago

5 0

Answer:

D. $x=-5,y=\frac{5}{4}$

Step-by-step explanation:

$\begin{bmatrix}5x+4y=-20\\ 5x+12y=-10\end{bmatrix}$

Subtract Equation 2 - Equation 1:

$5x+12y=-10\\-\\\underline{5x+4y=-20}\\8y=10$

Divide both sides by 8:

$\frac{8y}{8}=\frac{10}{8}$

$y=\frac{5}{4}$

Substitute $y=\frac{5}{4}$ into Equation 1:

$5x+4y=-20$

$5x+4\times \frac{5}{4}=-20$

$5x+5=-20$

Subtract 5 from both sides:

$5x+5-5=-20-5$

$5x=-25$

Divide both sides by 5:

$\frac{5x}{5}=\frac{-25}{5}$

$x=-5$

Bas_tet [7]3 years ago

4 0

Answer:

Step-by-step explanation:

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erastovalidia [21]

Answer:

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Step-by-step explanation:

Số tiền đã được giảm là : 16000 x 15% = 2400 Rs

Giá bán của chiếc TV là : 16000-2400= 13600 Rs

8 0

3 years ago

Read 2 more answers

You place a 16 foot ladder against a building. The angle that the ladder forms with

gulaghasi [49]

Answer:The base of the ladder should be placed so that it is one foot away from the building for every four feet of hight to where the ladder rests against the building. This is known as the 4 to 1 rule.

Step-by-step explanation:

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3 years ago

If using the method of completing the square to solve the quadratic

Nezavi [6.7K]

Answer:

25/4 or 6.25

Step-by-step explanation:

Given that the general equation of a quadratic equation is given as ax^2 + bx + c = 0, to complete the square, we subtract c from both sides of the equation and add the square of (b/2a) to both sides.Hence given x^2-5x-19=0, to complete the square, we add (-5/2)^2 to both sides following the illustration given.This is 25/4 or 6.24

3 0

3 years ago

Myles is tracking the growth of his palm tree. it was 62 inches when he bought it, and it has grown 6 inches per year. what does

Gre4nikov [31]

The initial value represents the height of the palm tree when the tree was first bought.
The input for the initial value is 0.
The output for the initial value is 62 inches.

What is initial value?

It is given that,

The height of the palm tree at the time Myles bought it was 62 inches.

He is tracking the growth of the tree and he has observed that it has grown 6 inches per year.

So, the initial value of the tree, here, is representing the height of the palm tree when it was bought.

As can be seen clearly, there is no input for the initial value. And, the output for the initial value is given to be 62 inches.

Learn more about initial value here:

brainly.com/question/8223651

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6 0

2 years ago

A school group is helping plant a new city garden. Today they used 12 1/2 pounds of potting soil and planted 2/5 of the garden.

Len [333]

Answer:

$18\frac{3}{4}$ pounds.

Step-by-step explanation:

Let x be the total amount of potting soil needed to complete the planting in new garden.

We are told that a school group is helping plant a new city garden. Today they used 12 1/2 pounds of potting soil and planted 2/5 of the garden. This means 2/5 of x equals to 12 1/2.

$\frac{2}{5} x=12\frac{1}{2}$

$\frac{2}{5} x=\frac{25}{2}$

$x=\frac{25}{2}\times\frac{5}{2}$

$x=\frac{125}{4}$

To find the amount of soil needed for the next of planting we will subtract the amount of potting soil used on the first day $(\frac{25}{2})$ from amount of total potting soil $(\frac{125}{4})$ .

$\text{Amount of potting soil needed for second day}=\frac{125}{4}-\frac{25}{2}$

$\text{Amount of potting soil needed for second day}=\frac{125}{4}-\frac{25\times 2}{2\times2}$

$\text{Amount of potting soil needed for second day}=\frac{125}{4}-\frac{50}{4}$

$\text{Amount of potting soil needed for second day}=\frac{75}{4}$

$\text{Amount of potting soil needed for second day}=\frac{75}{4}=18\frac{3}{4}$

Therefore, the group will need $18\frac{3}{4}$ pounds of potting soil to finish their work.

7 0

3 years ago