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4 years ago

Please help thanks!!!!!!!!!

Mathematics

1 answer:

marin [14]4 years ago

7 0

Plant A starts out with the highest cost.

As you can see the post starts at 2,000 which is higher than any other plant. Therefore; this must be the answer.

Hope this helped. Have a great night!

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The circumference of a sphere was measured to be 90 cm with a possible error of 0.5 cm.

Akimi4 [234]

Answer:

Error in the sphere's surface: 29 $cm^2$ and relative error in surface measure: 0.011

Error in the sphere's volume: 205 $cm^3$ and relative error in the volume measure: 0.017

Step-by-step explanation:

(a)

The measured length (l) of the circumference is 90 cm with an error of 0.5 cm, that is:

$l=2\,\pi\,R=90\,cm\\R=\frac{90}{2\,\pi} \,cm=\frac{45}{\pi} \,cm=14.3239\,\,cm$

and with regards to the error:

$dl=0.5 \, cm\\dl=2\,\pi\,dR\\dR=\frac{dl}{2\,\pi} =\frac{1}{4\,\pi} cm = 0.0796\,cm$

then when we use the formula for the sphere's surface, we get:

$S=4\,\pi\,R^2\\dS=4\,\pi\,2\,R\,(dR)\\dS=8\,\,\pi\.(\frac{45}{\pi} \,\,cm)\,(\frac{1}{4\pi}\,cm) =\frac{90}{\pi} \,\,cm^2\approx \,29\,cm^2$

Then the relative error in the surface is:

$\frac{dS}{S} =\frac{90/\pi}{4\,\pi\,R^2} =\frac{1}{90} =0.011$

(b)

Use the formula for the volume of the sphere:

$V=\frac{4\,\pi}{3} R^3\\dV=\frac{4\,\pi}{3}\,3\,R^2\,(dR)=4\,\pi\,R^2\,(\frac{1}{4\pi}) \,cm=(\frac{45}{\pi})^2 \,\,cm^3\approx 205\,\,cm^3$

Then the relative error in the volume is:

$\frac{dV}{V} =\frac{205}{12310.5} \approx 0.017$

3 0

3 years ago

Please help!

wariber [46]

Answer: 480 pennies
Explanation: 4/5=8/10 8/10-3/10= 5/10
240 pennies filled half of the bank thus 480

4 0

3 years ago

Help! Include working out in answer please :)

Sliva [168]

N represents the number in the sequence.
1st term: (1-2)/1^2=-1/1=-1
2nd term: (2-2)/2^2=0/4=0
3rd term: (3-2)/3^2=1/9

3 0

3 years ago

Find 6 times as many as,2plus 9

Alex17521 [72]

Answer:

The answer is 21.

Step-by-step explanation:

6 * 2 = 12 + 9 = 21

6 0

3 years ago

Read 2 more answers

Line CD bisects AB at point C. Find AC if AB = 56 feet

RideAnS [48]

Answer:

AC = 28 feet

Step-by-step explanation:

Point C is the midpoint of AB, so AC is half the length of AB:

AB/2 = (56 ft)/2 = 28 ft = AC

8 0

4 years ago