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2 years ago

Explain how to simplify this expression: 4a + 19 - 3a - 7 WRITER

Mathematics

2 answers:

mafiozo [28]2 years ago

7 0

Ok so put the a factors together first
4a + 19 - 3a - 7 = a + 19 + 7
a + 19 + 7 = a + 26

dem82 [27]2 years ago

7 0

Answer:

just use Mathwaz it shows you the steps and the answer

Step-by-step explanation:

algrabra only with a y

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19/258 = 21/?<br><br> help pls

Mashcka [7]

Answer:

Step-by-step explanation:

Given the expression;

19/258 = 21/x

We are to find the unknown value x;

Cross multiply;

19 * x = 258 * 21

19x = 5418

Divide both sides by 19;

19x/19 = 5418/19

x = 285.15

Hence the unknown value is 285.15

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2 years ago

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2 years ago

Which expression is equivalent to (x^1/2y^16)^1/2

Irina-Kira [14]

Xy^16 / 4

I don't really know how to explain it, but this is the answer

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3 years ago

Use the drop-down menus to choose steps in order to correctly solve 1+2b−13=12−4b−2b for b. Pls help

MrMuchimi

b=3

I found this out by subtracting and adding on both sides.

8 0

2 years ago

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Which equation represents a parabola that opens upward, has a minimum at x = 3, and has a line of symmetry at x = 3?

densk [106]

Answer:

$A.\ y = x^2 - 6x + 13$ is the correct answer.

Step-by-step explanation:

We know that vertex equation of a parabola is given as:

$y = a(x-h)^2+k$

where $(h,k)$ is the vertex of the parabola and

$(x,y)$ are the coordinate of points on parabola.

As per the question statement:

The parabola opens upwards that means coefficient of $x^{2}$ is positive.

Let $a = +1$

Minimum of parabola is at x = 3.

The vertex is at the minimum point of a parabola that opens upwards.

$\therefore$ $h = 3$

Putting value of a and h in the equation:

$y = 1(x-3)^2+k\\\Rightarrow y = (x-3)^2+k\\\Rightarrow y = x^2-6x+9+k$

Formula used: $(a-b)^2=a^{2} +b^{2} -2\times a \times b$

Comparing the equation formulated above with the options given we can observe that the equation formulated above is most similar to option A.

Comparing $y = x^2 - 6x + 13$ and $y = x^2-6x+9+k$

13 = 9+k

k = 4

Please refer to the graph attached.

Hence, correct option is $A.\ y = x^2 - 6x + 13$

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2 years ago

Read 2 more answers