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tamaranim1 [39]
3 years ago
5

A circle had a radius 20 cm. What is the area?

Mathematics
1 answer:
ruslelena [56]3 years ago
4 0

Answer:

use formula πr^2

Step-by-step explanation:

the area is 1257.14cm^2

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PilotLPTM [1.2K]

17.76(5) = 88.15 + 27.52 = 115.67


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8 0
3 years ago
Find axis of symmetry f(x)=2(x-5)(x+9)
Effectus [21]

Answer:

x = -2

Step-by-step explanation:

f(x) = 2( x^2 +9x -5x - 45)

f(x) = 2(x^2 + 4x - 45)

f(x) = 2x^2 +8x -90

axis of symmetry formula: x = -b / 2a

x = -(8) / 2(2)

x = -8 / 4

x = -2

*you can also graph the equation on a graphing calculator and find the middle of the parabola

7 0
3 years ago
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3 years ago
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Given triangle DEF similar to triangle GHF. Enter segments in the blanks provided that would result in a true equation.
Paul [167]

Given:

The triangles DEF is similar to GHF.

The objective is to find a similar ratio of DF/DE.

Explanation:

Using the basic proportionality theorem, for the similar triangles DEF and GHF,

\frac{DE}{GH}=\frac{DF}{GF}=\frac{EF}{HF}\text{ . . . .   ..  .(1)}

Considering the first two ratios of equation (1),

\frac{DE}{GH}=\frac{DF}{GF}

On interchanging the segments further,

\frac{DF}{DE}=\frac{GF}{GH}

Hence, the required segment in the blanks is GF/GH.

4 0
2 years ago
Write a recursive formula for the sequence <br><br> -1,-2,-3,-4...
myrzilka [38]

Answer:

  f(1) = -1

  f(n) = f(n-1) -1

Step-by-step explanation:

The first term is -1. Each term is 1 less than the previous. These equations say that.

  f(1) = -1

  f(n) = f(n-1) -1

7 0
4 years ago
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