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Mathematics

2 answers:

Serga [27]3 years ago

6 0

Answer:

divide 81 by pi and then by 2

Step-by-step explanation:

Mandarinka [93]3 years ago

6 0

Answer:

C= 2pi x R

81= 6.28 x r

81 % 6.28 = r

r =12.89

Step-by-step explanation:

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10. What is the value of x?<br> 105°<br> 148°<br> x

Ostrovityanka [42]

Answer:

Step-by-step explanation:

The supplement of 105 = 180 - 105 = 75

The supplement of 148 = 180 -148 = 32

x is the sum of these two angles

x = 32 + 75

x = 107

Exterior angles are the sum of the 2 angles not connect to the exterior angle you are trying to find.

4 0

3 years ago

What is the vertex of f(x)=-x^2-8x

frez [133]

$\bf f(x) = -x^2-8x\implies f(x) = -x^2-8x+0 \\\\[-0.35em] ~\dotfill\\\\ \textit{vertex of a vertical parabola, using coefficients} \\\\ f(x)=\stackrel{\stackrel{a}{\downarrow }}{-1}x^2\stackrel{\stackrel{b}{\downarrow }}{-8}x\stackrel{\stackrel{c}{\downarrow }}{+0} \qquad \qquad \left(-\cfrac{ b}{2 a}~~~~ ,~~~~ c-\cfrac{ b^2}{4 a}\right) \\\\\\ \left(-\cfrac{-8}{2(-1)}~~,~~0-\cfrac{(-8)^2}{4(-1)} \right)\implies \left( -4~~,~~0+\cfrac{64}{4} \right)\implies (-4~,~16)$