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3 years ago

Can somebody help me with this plz......

Mathematics

1 answer:

adelina 88 [10]3 years ago

5 0

Answer:

He must score 83 in the last test.

Step-by-step explanation:

To get a mean of 80 Terry must score a total of 4*80 = 320 over the 4 tests.

So his score for the last test must be 320 - (71 + 80 + 86)

= 320 - 237

= 83.

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Step-by-step explanation:

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Step-by-step explanation:

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3 years ago

Graph:<br> Y:3sin(2x-pi/3)-2<br><br> Find max,min,amplitude,horizental shift,and vertical shift)

patriot [66]

Max:
Min:
Amplitude: 3
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3 years ago

A solid cylinder of iron whose diameter is 18 cm and height 12 cm is melted and turned into a solid sphere. Find the diameter of

finlep [7]

Answer:

Diameter of sphere = 18 cm

Step-by-step explanation:

<h2>Volume of Cylinder and Sphere:</h2><h3> Cylinder:</h3>

Diameter = 18 cm

r = 18÷ 2 = 9 cm

h = 12 cm

$\sf \boxed{\bf Volume \ of \ cylinder = \pi r^2h}$

= π * 9 * 9 * 12 cm³

<h3>Sphere:</h3>

$\sf \boxed{\text{\bf Volume of sphere = $\dfrac{4}{3} \pi r^3$}}$

Solid cylinder is melted and turned into a solid sphere.

Volume of sphere = volume of cylinder

$\sf \dfrac{4}{3}\pi r^3 = \pi *9*9*12$

$\sf r^{3}= \dfrac{\pi *9*9*12*3}{4*\pi }\\\\ r^{3}=9 * 9 *3 *3\\\\\\r = \sqrt[3]{9*9*9}\\\\ r = 9 \ cm\\\\diameter = 9*2\\\\\boxed{diameter \ of \ sphere = 18 \ cm}$

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1 year ago