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Svet_ta [14]
3 years ago
6

PLSS HELP IF YOU TURLY KNOW THISS

Mathematics
2 answers:
yaroslaw [1]3 years ago
6 0

Answer:

x = 11

Step-by-step explanation:

(0.3x - 2.1)/3 = 0.4

0.3x - 2.1 = 0.4 * 3

0.3x - 2.1 = 1.2

0.3x = 1.2 + 2.1

0.3x = 3.3

x = 3.3/0.3

x = 11

kenny6666 [7]3 years ago
6 0

Answer:

\frac{0.3x - 2.1}{3}  = 0.4 \\ 0.3x - 2.1 = 0.4 \times 3 \\ 0.3x - 2.1 = 1.2 \\ 0.3x = 1.2 + 2.1 \\ 0.3x = 3.3 \\ x =  \frac{3.3}{0.3}  \\  \boxed{x = 11}

  • <u>x = 11</u> is the right answer.
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This si more tiring than actually doing the work
DENIUS [597]

Answer:

D(WZ║XY)

Step-by-step explanation:

The definition of a trapezoid is "a quadrilateral with only one pair of parallel sides".  WX and ZY are obviously not parrelel, so you need WZ and XY to be parellel to follow the criteria of a trapezoid.

6 0
3 years ago
1. Write a quadratic function, in standard form, that fits the set of points. Solve it as a system of three equations
sasho [114]

Answer:

The equation is y=2x^2+4x-7

Step-by-step explanation:

Let the quadratic function be


y=ax^2+bx+c


The point (-4,9) must satisfy this function,

\Rightarrow a(-4)^2+b(-4)+c=9


\Rightarrow 16a-4b+c=9...(1)


The point (0,-7) must also satisfy this function,

\Rightarrow a(0)^2+b(0)+c=-7


\Rightarrow c=-7...(2)



The point (1,-1) must also satisfy this function,

\Rightarrow a(1)^2+b(1)+c=-1


\Rightarrow a+b+c=-1...(3)


We put equation 2 into equation 1 to get;


\Rightarrow 16a-4b-7=9


\Rightarrow 16a-4b=16


\Rightarrow 4a-b=4...(5)


We again put equation 2 into equation 3 to get;


\Rightarrow a+b-7=-1


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We add equation 5 and 6 to get;

5a=10


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We put a=2 into equation 6 to get;


2+b=6


\Rightarrow b=6-2


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The equation is therefore y=2x^2+4x-7

5 0
3 years ago
Evaluate the expression when y = - 3.<br> - 7y2
yuradex [85]
So what you do for this one if you plug it in.
-7y2. So you have -7(-3)^2 which is -7(9) which is -63. So your answer is -63. Hope this helps!!!
4 0
3 years ago
Read 2 more answers
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krok68 [10]

Answer:

4

Step-by-step explanation:

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4 0
3 years ago
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Nuetrik [128]

Answer:

V= 392 ft^3

Step-by-step explanation:

We know that the volume V of a pyramid is one-third the area of the base B times the height h.

If h= 8ft and areabase = 7ft x 7ft = 49 ft^2.

Then, the Volume V is:

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So the solution is option D.

7 0
3 years ago
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