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scoundrel [369]
3 years ago
10

What does this mean ?

Mathematics
2 answers:
Roman55 [17]3 years ago
8 0

Step-by-step explanation:

Area= 13.86 cm²

πr²= 13.86 cm²

r= √13.81 ×7/22

r= 2.1 cm

Circumference= 2πr

= 2 × 22 × 2.1 / 7

=13.2 cm

STatiana [176]3 years ago
4 0

Answer:

circumference is the outside area of a circle

area of the circle is the inside area

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Find the discriminant and determine the nature of the roots to the quadratic equation
Katen [24]
№17
x^{2} +6x-7=0 \\ D=6 ^{2} -4*(-7)=36+28=64=8 ^{2}  \\  \\  x_{1} = \frac{-6+8}{2} =1 \\  \\  x_{2} = \frac{-6-8}{2} =-7
Answer: x₁ = 1
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№18
2 x^{2} -3x+4=3 \\ 2 x^{2} -3x+4-3=0 \\ 2 x^{2} -3x+1=0 \\  \\ D= -3 ^{2} -4*2=9-8=1 \\  \\  x_{1} = \frac{3+1}{2*2} = \frac{4}{4} =1 \\  \\  x_{2} = \frac{3-1}{2*2} = \frac{2}{4} =0.5
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№19
2 x^{2} -4x-5=0 \\  D=-4 ^{2} -4*2*(-5)=16+40=56 \\  \\  x_{1}= \frac{4+ \sqrt{56} }{2*2}  = \frac{4}{4} + \sqrt{ \frac{56}{16} } =1+ \sqrt{3.5}  \\  \\  x_{2} = \frac{4- \sqrt{56} }{2*2} = \frac{4}{4} -  \sqrt{ \frac{56}{16} } =1- \sqrt{3.5} 

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               x₂ = 1 - √3.5

3 0
4 years ago
Round 14.613 in the nearest tenth
garik1379 [7]
14.613 rounded to nearest tenth is 14.6.

This is because 1 is before 5 and not after 5, so it stays 6 and doesn't turn 7. <span />
8 0
3 years ago
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nexus9112 [7]

Answer:

diameter

Step-by-step explanation:

5 0
4 years ago
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yarga [219]

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7 0
3 years ago
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Vsevolod [243]
We have 4 people in our home
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4 people takes 135 days
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4 years ago
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