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3 years ago

X^2+X=56 Help please!!!!

Mathematics

1 answer:

stich3 [128]3 years ago

3 0

The value of x is either +7 or -8

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Express your answer in the smallest unit: 338km+ 62km 71m

Alexeev081 [22]

Adding all of the together would be 471... but I need clarification on the problem

8 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

I need help please! In each case below, list the lettered measures for angles or sides in descending order (FROM GREATEST TO LEA

Hitman42 [59]

Answer:

a > b > c

Step-by-step explanation:

The longest side is the one that sees the angle with the biggest measure

The angles are shown in the image, the third angle is 75 degrees (because the sum of interior angle is equal to 180)

So the list of the sides in descending order is as follows :

a > b > c (a sees angle measure 75, b sees angle measure 70, and c sees angle measure 35)

8 0

3 years ago

An 8-pound bag of cement costs $12.73. What is the unit price, rounded to the nearest cent?

tester [92]

Answer:

$1.60

Step-by-step explanation:

12.73÷8 = 1.59125

(1.59 rounded is 1.60)

8 0

3 years ago

Read 2 more answers

Please help me and hurry

Darya [45]

A and b equal each other

8 0

3 years ago