What is the value of --21 – (--10)? a. - 31 b. - 11 c. - 10 d. 31 e. 1\

1 answer:

7 0

E. 11 or b. -11somebody just helped me and they said its really 11 cause they gone try to trick us. but the other person was saying -11 because it has negative sign in the equation.

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Find the value of the unknown number in the proportion 17/80=p/100

rjkz [21]

17/80 = p/100

p = 17/80 * 100

p = 0.2125 * 100

p = 21.25

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3 years ago

The area of the parallelogram below is ____ square meters. A parallelogram with height labeled with 8 meters. The top horizontal

zzz [600]

Answer: answer is 96

Step-by-step explanation: you have to multiply 8 6 and 2 together to get your answer

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3 years ago

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HELP NOWWWWW PLEASEEEEE<br> How many 1/3's are in 1 and 2/3?

kiruha [24]

Answer:

5 thirds

Step-by-step explanation:

Make 1 2/3 into a improper fraction. Now you have 5/3. 5/3-(1/3*5)=0

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3 years ago

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. A right cylindrical drum is to hold 7.35 cubic feet of liquid. Find the dimensions (radius of the base and height) of the drum

Drupady [299]

Answer:

$r=1.05\ \text{ft}$

$h=2.12\ \text{ft}$

$20.91\ \text{ft}^3$

Step-by-step explanation:

r = Radius

h = Height

Volume of cylinder = $7.35\ \text{ft}^3$

$V=\pi r^2h\\\Rightarrow h=\dfrac{V}{\pi r^2}\\\Rightarrow h=\dfrac{7.35}{\pi r^2}$

Surface area is given by

$A=2\pi r^2+2\pi rh\\\Rightarrow A=2\pi r^2+2\pi r\dfrac{7.35}{\pi r^2}\\\Rightarrow A=2\pi r^2+\dfrac{14.7}{r}$

Differentiating with respect to radius we get

$\dfrac{dA}{dr}=4\pi r-\dfrac{14.7}{r^2}$

Equating with zero we get

$0=4\pi r-\dfrac{14.7}{r^2}\\\Rightarrow 4\pi r=\dfrac{14.7}{r^2}\\\Rightarrow r^3=\dfrac{14.7}{4\pi}\\\Rightarrow r=(\dfrac{14.7}{4\pi})^{\dfrac{1}{3}}\\\Rightarrow r=1.05$

$\dfrac{d^2A}{dr^2}=4\pi-2\times \dfrac{14.7}{r^3}\\\Rightarrow \dfrac{d^2A}{dr^2}=4\pi+2\times \dfrac{14.7}{1.05^3}\\\Rightarrow \dfrac{d^2A}{dr^2}=37.96>0$