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stiks02 [169]
2 years ago
6

What is the value of the expression when n = 3? - 2n(5 + n-8-3n)

Mathematics
1 answer:
lys-0071 [83]2 years ago
5 0
  • Answer:

<em>54</em>

  • Step-by-step explanation:

<em>- 2n(5 + n - 8 - 3n) =</em>

<em>replace n = 3</em>

<em>- 2(3)(5 + 3 - 8 - 3×3)</em>

<em>= - 6(8 - 8 - 9)</em>

<em>= - 6(0 - 9)</em>

<em>= - 6 × - 9</em>

<em>= 54</em>

<em>(-)(-) = +</em>

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On a coordinate plane, square P Q R S is shown. Point P is at (4, 2), point Q is at (8, 5), point R is at (5, 9), and point S is
sergey [27]

Answer:

(D)The midpoint of both diagonals is (4 and one-half, 5 and one-half), the slope of RP is 7, and the slope of SQ is Negative one-sevenths.

Step-by-step explanation:

  • Point P is at (4, 2),
  • Point Q is at (8, 5),
  • Point R is at (5, 9), and
  • Point S is at (1, 6)

Midpoint of SQ =\frac{1}{2}(1+8,5+6)=(4.5,5.5)

Midpoint of PR =\frac{1}{2}(4+5,2+9)=(4.5,5.5)

Now, we have established that the midpoints (point of bisection) are at the same point.

Two lines are perpendicular if the slope of one is the negative reciprocal of the other.

In option D

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Therefore, lines RP and SQ are perpendicular.

Option D is the correct option.

6 0
2 years ago
An item regularly priced at $80 is on sale for 20% off. There is a 3% sales tax.
Katena32 [7]

Answer:$14.08 and the discount is $16

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6 0
2 years ago
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Step-by-step explanation:

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2. Find the correspondents, then determine what inequality to use. In this case, you will use <em>less than</em><em> </em><em>or equal</em><em> </em><em>to</em><em> </em>because overpaying is UNNECESSARY.

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I am joyous to assist you anytime.

3 0
2 years ago
Read 2 more answers
Examine the steps used to solve the equation.
Elina [12.6K]

Answer:

see below

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12.5x − 10.2 = 3(2.5x + 4.2) - 6  

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12.5x − 10.2 = 7.5x + 12.6 − 6  

Combine like terms

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Add 10.2 to each side of the equation by using the addition property of equality

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Subtraction 7.5x from each side of the equation by using the subtraction property of equality

5x = 16.8  

Divide by 5 on each side by using the division property of equality

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2 years ago
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