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3 years ago

PLS HELP ME ASAP FOR 7, 8, 9. A and B!! (MUST SHOW WORK!!) + LOTS OF POINTS!!

Mathematics

1 answer:

Readme [11.4K]3 years ago

8 0

7. 3.14(12^2 - 10^2)=3.14(144-100) = 3.14(44)=138.16
8. A = piR^2 = 50.24. R^2 = 50.24/3.14 = 16. R = 4cm
9a) Perimeter of square is 4*18 = 72. Perimeter of circle is 2*pi*r. r=9in
perimeter of circle is then 2*3.14.9 = 56.52. Difference is 72-56.52 = 15.48
9b) Area of square is 18^2 = 324.
Area of circle is 3.14(9^2) = 254.34. Difference is the unshaded part
324-254.34 = 69.66in^2

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Step-by-step explanation:

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Read 2 more answers

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Studentka2010 [4]

Answer:

D) $(-2,-9)$

Step-by-step explanation:

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Therefore, if $f(x)=0$ , then $0+9=x^2+4x-5+9$ completes the square on the right side
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This means that our function in vertex form is $f(x)=(x+2)^2-9$

Therefore, the vertex of the graph is $(h,k)=(-2,-9)$ .

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3 years ago