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3 years ago

Yesterday, 4/7 of the 210 students in a contest gave their speeches. How many students gave their speeches?

Mathematics

1 answer:

Elenna [48]3 years ago

6 0

Answer:

120.

Step-by-step explanation:

210 * 4/7

= 30 * 4

= 120.

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What is the circumference of the circle 5 in

Ganezh [65]

Answer:

The circumference of this circle is 10pi inches, which is roughly 31.4 inches.

Step-by-step explanation:

Use the formula for circumference. C= 2*radius*pi.

2*5*pi=10pi

pi=3.14, so multiply that by 10

3.14*10=31.4 inches.

8 0

3 years ago

Please help me with this problem. I'm kind of stuck and don't know what to do.

Flauer [41]

Try this option:

1) if csc(u)=9, then 1/sin(u)=9 and sin(u)=1/9;

2) if sin(u)=1/9, then cos(u):

$cos(u)=\sqrt{1-sin^2(u)}=\sqrt{1-\frac{1}{81}}=\frac{4\sqrt{5}}{9};$

3) $if \ sin(u)=\frac{1}{9} \ and \ cos(u)=\frac{4\sqrt{5}}{9}, then$

$sin(2u)=2sin(u)*cos(u)=\frac{8\sqrt{5}}{81};$

$cos(2u)=cos^2(u)-sin^2(u)=\frac{80}{81}-\frac{1}{81}=\frac{79}{81};$

$tan(2u)=\frac{sin(2u)}{cos(2u)}=\frac{\frac{8\sqrt{5}}{81}}{\frac{79}{81} }=\frac{8\sqrt{5}}{79}.$

8 0

2 years ago

Que % es 25 de 200 que % es 30 de 480 que % es 65 de 80 que % es 24 de 30

Alenkasestr [34]

25% de 200 = 50

30% de 480 = 144

65% de 80 = 52

24% de 30 = 7.2

6 0

3 years ago

Mitosis and meiosis escape room level 5 please help

guapka [62]

Mitosis is division of your body cells and meiosis is the same thing but for your sex cells

6 0

3 years ago

What is the quotient of 1.728 x 109 and 4.8 x 106 expressed in scientific notation?

fenix001 [56]

Step-by-step explanation:

$\to 1,728 \times {10}^{9}$

$= 1,728 \times {10}^{9}$

$= 1,728 \times 1.000.000.000$

$= 1.728.000.000$

$1,728 \times {10}^{9} = 1.728.000.000$

$\:$

$\to 4,8 \times {10}^{6}$

$= 4,8 \times {10}^{6}$

$= 4,8 \times 1.000.000$

$= 4.800.000$

$4,8 \times {10}^{6} = 4.800.000$

4 0

3 years ago