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Zinaida [17]
3 years ago
9

The sales tax for an item was $12.80 and it cost $320 before tax.

Mathematics
1 answer:
antiseptic1488 [7]3 years ago
7 0

Answer:

Step-by-step explanation:

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What is the y-intercept of y=−3x−2
erastova [34]
-2.

It is in y=mx+b form.  And 'b' is the y-inter.   -2 is in the 'b' place, therefore, -2 is the y-inter 

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3 years ago
12,13,14 help please
PSYCHO15rus [73]
12. 15 (3x5x1)
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5 0
3 years ago
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If < A and < B are vertical angles, and < A = 5x - 1 degrees, and < B = 4x + 4 degrees, find x.
ArbitrLikvidat [17]

Answer:

x = 5

Step-by-step explanation:

vertical angles are congruent , so

∠ A = ∠ B , that is

5x - 1 = 4x + 4 ( subtract 4x from both sides )

x - 1 = 4 ( add 1 to both sides )

x = 5

4 0
2 years ago
If a polynomial is divided by a binomial and the remainder is zero, what does that tell you about the relationship between the b
OleMash [197]

Answer:

Step-by-step explanation:

The binomial is a factor of the polynomial.

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2 years ago
Hey how do you get from standard form to vertex form?
vlabodo [156]

Explanation:

Conversion of a quadratic equation from standard form to vertex form is done by completing the square method.

Assume the quadratic equation to be \mathbf{ax^{2}+bx+c=0} where x is the variable.

Completing the square method is as follows:

  1. send the constant term to other side of equal                 \mathbf{ax^{2}+bx=-c}
  2. divide the whole equation be coefficient of \mathbf{x^{2}}, this will give     \mathbf{x^{2}+\frac{b}{a}x=- \frac{c}{a}}
  3. add \mathbf{(\frac{b}{2a})^{2}} to both side of equality                                   \mathbf{x^{2}+2\times\frac{b}{2a}x+\frac{b}{2a}^{2}=-\frac{c}{a}+\frac{b}{2a}^{2}}
  4. Make one fraction on the right side and compress the expression on the left side                                                                          \mathbf{(x+\frac{b}{2a})^{2}=\frac{b^{2}-4ac}{4a^{2}}}
  5. rearrange the terms will give the vertex form of standard quadratic equation                                                                 \mathbf{a(x+\frac{b}{2a})^{2}-\frac{b^{2}-4ac}{4a}=0}

Follow the above procedure will give the vertex form.

(NOTE : you must know that \mathbf{(x+a)^{2}=x^{2}+2ax+a^{2}}. Use this equation in transforming the equation from step 3 to step 4)

8 0
3 years ago
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