3 years ago

While she was training for a marathon Lucy ran a total of 120 kilometers. How many meters did she run

Mathematics

1 answer:

Mekhanik [1.2K]3 years ago

3 0

ANSWER

My answer is in the photo above

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I really need help on this, how do you get 20 as a denominator and 19 as a numerator in the end answer? Pls help

valentina_108 [34]

Answer:

ADD them

Step-by-step explanation:

11 1/5+ 5 1/4 is 19/20

If you were subtracting the fractions your answer would be different (look at attachment)

7 0

3 years ago

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Find the volume of the solid that lies between planes perpendicular to the x-axis at x = pi/4 and x = 5pi/4. The cross-sections

svp [43]

Answer:

The volume of the solid = π²

Step-by-step explanation:

As per the given data of the questions,

The diameter of each disk is

D = 2 sin(x) - 2 cos(x)

So its radius is

R = sin(x) - cos(x).

The area of each disk is

$= \pi \times(sinx-cosx)^{2}$

$= \pi \times [sin^{2}(x) - 2 sin(x) cos(x) + cos^{2}(x)]$

$= \pi[1-2sin(x)cos(x)]$

$= \pi[1-sin(2x)]$

Now,

Integrate from $x=\frac{\pi}{4}\ \ \ to\ \ \ x=\frac{5\pi}{4}$ , we get volume:

$V=\int_{\frac{\pi}{4}}^{\frac{5\pi}{4}} \pi[1-sin(2x)]dx$

After integrate without limit we get

$V=\pi[x+\frac{cos2x}{2}]$

Now after putting the limit, we get

V = π²

Hence, the required volume of the solid = π²

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3 years ago

Geometry homework help <br><br> Will give brainliest:)

tekilochka [14]

Answer:

180-37=143 degrees

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3 years ago

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S over 4= -3.2 find the value of s

ryzh [129]

Answer:

s = - 12.8

Step-by-step explanation:

Given

$\frac{s}{4}$ = - 3.2 ( multiply both sides by 4 to clear the fraction )

s = 4 × - 3.2 = - 12.8

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3 years ago

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write sixty-nine million fifty-eight thousand, two hundred nineteen and three hundredths in standard form show your work will ma

KIM [24]

69,058,219.03

In standard form,

$6.905821903 \times {10}^{7}$

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3 years ago