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Alexus [3.1K]
3 years ago
5

Ms. Smiths block 2 class has 30 students. 2/3 of them are absent on a field trip for science. How many students in the class are

absent because they are on the field trip?
Mathematics
2 answers:
Olenka [21]3 years ago
7 0
20 because if you think about it 2/3 is equal to 20/30.
Papessa [141]3 years ago
5 0
20 of the kids are absent
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Help please due tonight <br><br>50 points + brainliest​
Leviafan [203]

Answer:

7. -37/36 or -1 1/36

8. -3/10

9. 1/24

10. -118/21 or -5 13/21

11. 97/12 or 8 1/12

12. 49/8 or 6 1/8

Step-by-step explanation:

To subtract fractions, they must have the same denominator. The common denominator will be the LCM (lowest common multiple) of the two denominators. Then, combine the fractions and simplify.

7. -\frac{1}{4}-\frac{7}{9}  Find a common denominator

=-\frac{1*9}{4*9}-\frac{7*4}{9*4}

=-\frac{9}{36}-\frac{28}{36}

=\frac{-9-28}{36}   Combine the fractions

=\frac{-37}{36}    Answer. Already in lowest terms.

=-1\frac{1}{36} Keep a negative number. 37 goes into 36 one time, leaving 1 remainder (becomes numerator)

8. \frac{3}{5}-\frac{9}{10} Find a common denominator

=\frac{3*2}{5*2}-\frac{9}{10}

=\frac{6}{10}-\frac{9}{10}

=\frac{6-9}{10} Combine the fractions

=\frac{-3}{10} Answer in simplest form.

9. \frac{5}{8}-\frac{7}{12} Find common denominator

=\frac{5*3}{8*3}-\frac{7*2}{12*2}

=\frac{15}{24}-\frac{14}{24}

=\frac{15-14}{24} Combine the fractions

=\frac{1}{24} Answer in simplest form

10. -1\frac{1}{3}-4\frac{2}{7} Translate to improper fraction

=-\frac{4}{3}-\frac{30}{7} Multiplied each whole number with base, added to numerator

=-\frac{28}{21}-\frac{90}{21} Found common denominator

=\frac{-28-90}{21} Combined fractions

=\frac{-118}{21} Answer in improper form

=-5\frac{13}{21} Answer as a mixed number

11. 5\frac{5}{6}-(-2\frac{1}{4}) Convert to improper fraction

\frac{35}{6}-(-\frac{9}{4}) Two minuses make a plus

=\frac{35}{6}+\frac{9}{4} Find common denominator

=\frac{35*2}{6*2}+\frac{9*3}{4*3}

=\frac{70}{12}+\frac{27}{12}

=\frac{70+27}{12} Combined fractions

=\frac{97}{12} Answer as improper fraction

=8\frac{1}{12} Answer as mixed fraction

12. 12\frac{1}{2}-6\frac{3}{8} Convert to improper fraction

\frac{25}{2}-\frac{51}{8}

\frac{25*4}{2*4}-\frac{51}{8} Find common denominator

\frac{100}{8}-\frac{51}{8}

\frac{100-51}{8} Combined fractions

\frac{49}{8} Answer as improper fraction

8\frac{1}{8} Answer as mixed number

5 0
3 years ago
Use Stokes' Theorem to evaluate C F · dr where C is oriented counterclockwise as viewed from above. F(x, y, z) = 2yi + xzj + (x
Lady_Fox [76]

By Stokes' theorem, the line integral of \vec F over C is given by the surface integral of the curl of \vec F over S, where S is the region of intersection of the plane z=y+6 and the cylinder x^2+y^2=1 with S having positive/upward orientation.

Parameterize S by

\vec s(u,v)=u\cos v\,\vec\imath+u\sin v\,\vec\jmath+(u\sin v+6)\,\vec k

with 0\le u\le1 and 0\le v\le2\pi.

Take the normal vector to S to be

\vec s_u\times\vec s_v=-u\,\vec\jmath+u\,\vec k

The curl of \vec F is

\nabla\times\vec F(x,y,z)=(1-x)\,\vec\imath-\vec\jmath+(z-2)\,\vec k

Then the line integral is equivalent to

\displaystyle\int_C\vec F\cdot\mathrm d\vec r=\iint_S(\nabla\times\vec F)\cdot\mathrm d\vec S

=\displaystyle\int_0^{2\pi}\int_0^1\bigg((1-u\cos v)\,\vec\imath-\vec\jmath+(u\sin v+4)\,\vec k\bigg)\cdot\bigg(-u\,\vec\jmath+u\,\vec k\bigg)\,\mathrm du\,\mathrm dv

=\displaystyle\int_0^{2\pi}\int_0^1(5u+u^2\sin v)\,\mathrm du\,\mathrm dv=\boxed{5\pi}

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The answer is
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