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shusha [124]
2 years ago
14

Calculate the surface area of a sphere of radius 5.6 cm. Give your answer to 3 s.f.

Mathematics
2 answers:
Mariana [72]2 years ago
7 0

Answer:

394

Step-by-step explanation:

svlad2 [7]2 years ago
4 0

Answer:

394

Step-by-step explanation:

Surface area of a sphere=4πr^2

4*pi*5.6^2=394.08

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Suppose a parabola has an axis of symmetry at x=-5, a maximum height of 9, and passes through the point (-7,1). Write the equati
Nutka1998 [239]

the parabola has maximum at 9, meaning is a vertical parabola and it opens downwards.

it has a symmetry at x = -5, namely its vertex's x-coordinate is -5.

check the picture below.

so then, we can pretty much tell its vertex is at (-5 , 9), and we also know it passes through (-7, 1)


\bf ~~~~~~\textit{parabola vertex form} \\\\ \begin{array}{llll} y=a(x- h)^2+ k\qquad \leftarrow \textit{using this one}\\\\ x=a(y- k)^2+ h \end{array} \qquad\qquad vertex~~(\stackrel{}{ h},\stackrel{}{ k}) \\\\[-0.35em] \rule{34em}{0.25pt}\\\\ \begin{cases} h=-5\\ k=9 \end{cases}\implies y=a[x-(-5)]^2+9\implies y=a(x+5)^2+9


\bf \textit{we also know that } \begin{cases} x=-7\\ y=1 \end{cases}\implies 1=a(-7+5)^2+9 \\\\\\ -8=a(-2)^2\implies -8=4a\implies \cfrac{-8}{4}=a\implies -2=a \\\\[-0.35em] ~\dotfill\\\\ ~\hfill y=-2(x+5)^2+9~\hfill

7 0
3 years ago
Given: AD || BC and AD ≅ BC<br><br>Prove: AB || CD
Nana76 [90]

Answer:

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Step-by-step explanation:

6 0
2 years ago
What number is half way between 21 and 63?
andre [41]
The # halfway in between 21 and 63 is 42.
8 0
3 years ago
Dale tried to estimate the area of his backyard garden. He guessed it was 12 square meters. When he measured the dimensions late
Elena-2011 [213]

Answer:

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Step-by-step explanation:

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If A's income is 25% less than that of B, then how much percent is B's income more than that of A?​
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Let's say that B makes $100.

Then A makes $75.

So, your question then becomes 100 is what percent of 75?

This can be solved by setting up the proportion 100 / 75 = x / 100

75x = 10000

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So, B's income is 33.3% more than A's income.
7 0
3 years ago
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