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Ivenika [448]
3 years ago
5

lisa is ordering sand from the internet. On one site she found sand on sale for $2.25 per pound and on the second site she found

5kg of sand on sale for $14.00. Which is the better deal?
Mathematics
1 answer:
Anuta_ua [19.1K]3 years ago
3 0
<h3>The better deal would be the the 5kg for $14 price.</h3><h3 /><h3>Why: 5kg is around 11 pounds, so if you bought the 11 pounds on the first site, it would be $24.75. So Lisa would save 10 dollars if she chose the second site.</h3><h3 /><h3>If this answer is correct, please mark it as Brainliest. :)</h3>
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Can someone please answer this question?
MrMuchimi

Answer:

y = x - 3

Step-by-step explanation:

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3 years ago
Im leaving brainly first to this question gets brainliest i giving away all my points so i have only have one question
ehidna [41]

Answer:

gta v

Step-by-step explanation:

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3 years ago
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Jason plotted the points (4,4) and (-4,-4) on a coordinate plane. He says that the distance between the two points is 8 units be
Nataly_w [17]
The distance between two points is calculated through the equation,
                                 d = √(x₂ - x₁)² + (y₂ - y₁)²
Substituting the known values from the given above,
                                d = √(4 - -4)² + (4 - -4)²
                                  d = 8√2 = 11.31
The distance between the points is approximately equal to 11.31. The value that Jason presented is not the real distance because it does not account for the other set of coordinates. 
8 0
3 years ago
Maths functions question!!
Marina86 [1]

Answer:

5)  DE = 7 units and DF = 4 units

6)  ST = 8 units

\textsf{7)} \quad \sf OM=\dfrac{3}{2}\:units

8)  x ≤ -3 and x ≥ 3

Step-by-step explanation:

<u>Information from Parts 1-4:</u>

brainly.com/question/28193969

  • f(x)=-x+3
  • g(x)=x^2-9
  • A = (3, 0)  and C = (-3, 0)

<h3><u>Part (5)</u></h3>

Points A and D are the <u>points of intersection</u> of the two functions.  

To find the x-values of the points of intersection, equate the two functions and solve for x:

\implies g(x)=f(x)

\implies x^2-9=-x+3

\implies x^2+x-12=0

\implies x^2+4x-3x-12=0

\implies x(x+4)-3(x+4)=0

\implies (x-3)(x+4)=0

Apply the zero-product property:

\implies (x-3)= \implies x=3

\implies (x+4)=0 \implies x=-4

From inspection of the graph, we can see that the x-value of point D is <u>negative</u>, therefore the x-value of point D is x = -4.

To find the y-value of point D, substitute the found value of x into one of the functions:

\implies f(-4)=-(-4)=7

Therefore, D = (-4, 7).

The length of DE is the difference between the y-value of D and the x-axis:

⇒ DE = 7 units

The length of DF is the difference between the x-value of D and the x-axis:

⇒ DF = 4 units

<h3><u>Part (6)</u></h3>

To find point S, substitute the x-value of point T into function g(x):

\implies g(4)=(4)^2-9=7

Therefore, S = (4, 7).

The length ST is the difference between the y-values of points S and T:

\implies ST=y_S-y_T=7-(-1)=8

Therefore, ST = 8 units.

<h3><u>Part (7)</u></h3>

The given length of QR (⁴⁵/₄) is the difference between the functions at the same value of x.  To find the x-value of points Q and R (and therefore the x-value of point M), subtract g(x) from f(x) and equate to QR, then solve for x:

\implies f(x)-g(x)=QR

\implies -x+3-(x^2-9)=\dfrac{45}{4}

\implies -x+3-x^2+9=\dfrac{45}{4}

\implies -x^2-x+\dfrac{3}{4}=0

\implies -4\left(-x^2-x+\dfrac{3}{4}\right)=-4(0)

\implies 4x^2+4x-3=0

\implies 4x^2+6x-2x-3=0

\implies 2x(2x+3)-1(2x+3)=0

\implies (2x-1)(2x+3)=0

Apply the zero-product property:

\implies (2x-1)=0 \implies x=\dfrac{1}{2}

\implies (2x+3)=0 \implies x=-\dfrac{3}{2}

As the x-value of points M, Q and P is negative, x = -³/₂.

Length OM is the difference between the x-values of points M and the origin O:

\implies x_O-x_m=o-(-\frac{3}{2})=\dfrac{3}{2}

Therefore, OM = ³/₂ units.

<h3><u>Part (8)</u></h3>

The values of x for which g(x) ≥ 0 are the values of x when the parabola is above the x-axis.

Therefore, g(x) ≥ 0 when x ≤ -3 and x ≥ 3.

8 0
1 year ago
Read 2 more answers
Sofia walks from her house to the park.
Olegator [25]

Answer:

4:45

Step-by-step explanation:

What time after 40 minutes gives you 5:25?

If we go back 40 minutes from 5:25, Sofia left her house at 4:45

5 0
2 years ago
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