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3 years ago

Help me pleaseee i really need it

Mathematics

1 answer:

Rufina [12.5K]3 years ago

6 0

Answer:

96^2

Step-by-step explanation:

Area of all shapes added.

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Can someone simplify

Rashid [163]

Answer:

Option (2). $2\frac{1}{4}$

Step-by-step explanation:

The given expression is [ $-5\frac{1}{4}-(-7\frac{1}{2})$ ]

We can rewrite the fractions as,

$-5\frac{1}{4}$ = $-(5+\frac{1}{4})$

$-7\frac{1}{2}=-(7+\frac{1}{2})$

Now we will substitute the fractions in the expression,

$[-(5+\frac{1}{4})]-[-(7+\frac{1}{2})]$

= $-(5+\frac{1}{4})+(7+\frac{1}{2})$

= (-5 + 7) + $(-\frac{1}{4}+\frac{1}{2})$

= 2 + $\frac{2-1}{4}$

= 2 + $\frac{1}{4}$

= $2\frac{1}{4}$

Therefore, Option (2). will be the answer.

7 0

3 years ago

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

In a laboratory experiment, two mice will be placed in a simple maze with one decision point where a mouse can turn either left

rusak2 [61]

Nansjsjsjsjkakskskskalsso is not the

7 0

3 years ago

Solve C = 2πr (solve for "r")<br> C = 15<br><br> How dodo solve it

Y_Kistochka [10]

Substitute C for 15 then divide 2(pi). (pi)= 3.14
15 / 2(3.14)
15 / 6.28
r = 2.39
I hope this helped love!!

4 0

4 years ago

Read 2 more answers

Can y’all help me me pls I don’t want my dad to whoop me with a belt

Viefleur [7K]

Answer:

pretty sure its D. (200x^3)

hope this helps :) plz brainliest if wrong then don´t

Step-by-step explanation:

7 0

3 years ago