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3 years ago

Demarcus and Devon were working on this problem:

Mathematics

1 answer:

mafiozo [28]3 years ago

4 0

Answer:

Demarcus is right the phone will cost $345

Step-by-step explanation:

15% of 300 = 45

300+45=345

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A department store is having a 15% of sale on all winter coats you purchase a winter coat for 275. With 7.25% sale tax how much

yuradex [85]

Sale price for coat =
275 x 0.85 (decimal multiplier for 15% decrease) = £233.75
£233.75 x 1.0725 (decimal multiplier for 7.25% increase) = £250.70

8 0

4 years ago

Jeremy bought x pounds of peanuts for $4.50 per pound and y pounds of cashews for $7.05 per pound at the store for a retirement

Black_prince [1.1K]

4.5x+7.05y=$43.65

x+y=8
Timed 4.5 for both side to get
4.5x+4.5y=36

4.5x+7.05y=43.65
-
4.5x+4.5y=36
=
2.55y=7.65
y=3 pounds
x=5 pounds. Hope it help!

7 0

3 years ago

How do i do this???????????????????????????????????

Karo-lina-s [1.5K]

Answer:

The y-intercept is (0, -6).

Step-by-step explanation:

The question is asking you to find the equation of the line that passes through the point (7, 1) and is parallel to line j, which means that the line has the same slope as line j.

To find the slope of line j, you would use the slope formula: $\frac{y_2-y_1}{x_2-x_1}$ .

Use the points on line j: (4, 1), (-3, -6). Substitute in -6 for $y_2$ and 1 for $y_1$ . Substitute -3 for $x_2$ and 4 for $x_1$ .
$\frac{(-6)-(1)}{(-3)-(4)} \rightarrow \frac{-7}{-7} = 1$
The slope of line j is 1, therefore the equation of the line we are writing will also have a slope of 1 since they must be parallel.

To write the equation of the line, use the point-slope formula because we are given the two things in the name of the formula---a point that the line passes through (7, 1) and the slope of the line (1).

Point-slope form is $y-y_1=m(x-x_1)$
Substitute 1 for $y_1$ , 1 for m, and 7 for $x_1$ .
$y-(1)=1(x-(7))$
Simplify: y - 1 = 1(x - 7)
Distribute 1 inside the parentheses.
y - 1 = x - 7
Add 1 to both sides of the equation.
y = x - 6

The question wants you to find the y-intercept of the equation. To find the y-intercept, make x = 0.

y = (0) - 6
Subtract 0 - 6.
y = -6

A point is shown as (x, y). We made x = 0 and found that y = -6, so if you substitute these values into (x, y) the y-intercept will be (0, -6).

5 0

4 years ago

Manuel Romo sells tires at the local shopping mall. Romo earns 20 percent commission on the first $500, 25 percent on the next $

11111nata11111 [884]

His total commission is $482

Commission can be defined as the amount a person or an individual received for the sales of goods and services.

Now let determine the Total<em> </em>Commission

Total commission=(20%×$500) +(25%×$1,000)+[30%×($1,940-$1,500)

Total commission=(20%×$500) +(25%×$1,000)+(30%×$440)

Total commission=$100+$250+$132

Total commission=$482

Inconclusion his total commission is $482

Learn more here:

brainly.com/question/14493764

8 0

3 years ago

What is the difference of the polynomials? (Ă˘â‚¬""2x3y2 4x2y3 Ă˘â‚¬"" 3xy4) Ă˘â‚¬"" (6x4y Ă˘â‚¬"" 5x2y3 Ă˘â‚¬"" y5) Ă˘â‚¬""6x4y

zlopas [31]

Polynomial-An expression of two or more algebraic terms, which is the sum or difference of the several terms with having different power of the only variable. The difference between the given polynomials is

$=-2x^3y^2 + 9x^2y^3-3xy^4-6x^4y+y^5$

Given-

We have given two function of variable <em>x </em>and <em>y</em>

$(-2x^3y^2 + 4x^2y^3-3xy^4)$

$(6x^4y-5x^2y^3-y^5)$

<h3>Polynomial</h3>

An expression of two or more algebraic terms, which is the sum or difference of the several terms with having different power of the only variable.

Now we have to subtract the two equations to find the difference,

$(-2x^3y^2 + 4x^2y^3-3xy^4)-(6x^4y-5x^2y^3-y^5)$

Multiply the sign into the bracket to open the bracket and further solution,

$=-2x^3y^2 + 4x^2y^3-3xy^4-6x^4y+5x^2y^3+y^5$

Arrange the similar terms in the same groups,

$=-2x^3y^2 + (4x^2y^3+5x^2y)-3xy^4-6x^4y+y^5$ $=-2x^3y^2 + 9x^2y^3-3xy^4-6x^4y+y^5$

Hence, the difference between the given polynomials is $=-2x^3y^2 + 9x^2y^3-3xy^4-6x^4y+y^5$

For more about the polynomials, follow the link below-brainly.com/question/17822016

5 0

3 years ago