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musickatia [10]
3 years ago
8

The local newspaper has letters to the editor from 40 people. If this number represents 4% of all of

Mathematics
1 answer:
Setler79 [48]3 years ago
4 0

Answer:

1000 readers

Step-by-step explanation:

40 people represent 4% of the total number of readers.

4% is 1/25 of 100%, therefore:

4% x 25 = 100%

So, if we multiply the number of people that represent 4% by 25, we will get the total number (100%).

40 x 25 = 1,000

The newspaper has 1000 total readers.

Alternatively, you could also divide 4% (40) by 4 which would give you 1%=10. Multiply this by 100 to get 100% which gives us: 100% = 1000.

Hope this helped!

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2. Abby found the axis of symmetry, x-coordinate, the vertex, and y-intercept
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Using quadratic function concepts, it is found that Abby made a mistake on the coordinates of the vertex, which are (-4,1).

----------------------

  • A quadratic function is defined by:

y(x) = ax^2 + bx + c

  • The y-intercept is given by point: (0, y(0))
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----------------------

The function given is:

f(x) = -x^2 - 8x - 15

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  • f(0) = -0^2 - 8(0) - 15 = -15, thus, the y-intercept is (0, -15).

x_v = -\frac{b}{2a} = -\frac{(-8)}{2(-1)} = \frac{8}{-2} = -4

  • Thus, the <u>x-coordinate of the vertex</u> is x = -4, which is the same as the <u>axis of symmetry</u>.

f(-4) = -(-4)^2 - 8(-4) - 15 = 1

  • The vertex is given by: (-4,1).

A similar problem is given at brainly.com/question/14680175

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