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matrenka [14]
3 years ago
10

Natalia solved the problem below incorrectly. Find Natalia's mistake, explain what she should have done and tell me what the cor

rect answer is.
x÷5 + 2 = 7

x÷5 + 2 + -2= 7 + 2

x÷5 = 9

x÷5x5 = 9x5

x = 45
Mathematics
1 answer:
JulijaS [17]3 years ago
7 0

Answer:

She made the mistake in step 2.

Step-by-step explanation:

Natalia's mistake is that she added 2 to the 7 when she should have subtracted it.

x÷5 + 2 = 7

x÷5 + 2 -2 = 7 -2

x÷5 = 5

Then multiply both sided by 5 to get rid of the division on the left

x = 25

This gives us the answer to x.

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3 years ago
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The function f(t) = t2 + 4t − 14 represents a parabola. Part A: Rewrite the function in vertex form by completing the square. Sh
Cloud [144]

Answer:

A)  The vertex ( h , k) = ( -2 , -18)

B) The minimum value of the given function = - 18

C) The Axis of the symmetry for f(t) is y -axis

Step-by-step explanation:

A)

Given a parabola   f(t) = t² + 4 t − 14

                               f(t) =  t² + 2(2) t + (2)²-4− 14

                           f(t) = (t +2)² - 18

Let comparing  y = (x +2)² -18

                   (x +2)² = y + 18

                   (x-h))² = 4 a ( y - k))²

<em>The vertex ( h , k) = ( -2 , -18)</em>

B)

  Given a parabola   f(t) = t² + 4 t − 14

  Differentiating with respective to 't'

                                 f¹(t) = 2 t + 4

                                  f¹(t) = 2 t + 4 = 0

now                      t = \frac{-4}{2} = -2

Again Differentiating with respective to 't'

                    f^{ll} (t) = 2 (1) >0

f(x) has a minimum value at t = -2

Given f(t) = t² + 4 t − 14

         f( -2) = 4 + 4(-2) -14 = 4 -8 -14 = -18

The minimum value of the given function = - 18

C)

f(t) = (t +2)² - 18

Let comparing  y = (x +2)² -18

                   (x +2)² = y + 18

                   (x-h))² = 4 a ( y - k))²

The vertex ( h , k) = ( -2 , -18)

The Axis of the symmetry for f(t) is y -axis

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Triple a number divided by 5
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Answer:

If m is the midpoint of ab it means am is equal to mb

am = 3x + 8 and mb = 6x-4

and ab  = am + mb

first find the value of x by using am = mb

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ab = 3 (4) + 8

= 12 + 8 = 20 = mb

ab = am + mb

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Answer:

A,D and E

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Dependent

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