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Liono4ka [1.6K]
3 years ago
5

A brother and a sister are in the same math class. There are 9 boys and 12 girls in the class. One boy and one girl are randomly

chosen. What is the probability that both the brother and the sister are chosen?
Mathematics
1 answer:
rjkz [21]3 years ago
7 0

Answer:

9 : 12 or 9 to 12

Step-by-step explanation:

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Mrs. Butler worked on school things Monday afternoon. She spent a total of five hours on school. She graded 236 assignments and
marin [14]

Answer:

1 minute and 4 seconds

Step-by-step explanation:

5 hours - 1hour 20mins = 3hours 40 mins

3 hours 40 mins = 220 minutes

236 / 220 = 1.07272... x0.6 x 100 = 64.36... seconds

1 minute and 4 seconds

4 0
3 years ago
Sixteen students in a drama club want to attend a play. the tick price is $35 for each student, and the transportation and meals
otez555 [7]
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4 0
3 years ago
What are the values of a and b?
ivann1987 [24]

Answer:

<h2>a = 400/21, b = 580/21</h2>

Step-by-step explanation:

Small triangles are similar. Therefore, the sides are proportional

\dfrac{a}{20}=\dfrac{20}{21}               <em>cross multiply</em>

21a=(20)(20)       <em>divide both sides by 21</em>

a=\dfrac{400}{21}

For b, we can use the Pythagorean theorem:

b^2=\left(\dfrac{400}{21}\right)^2+20^2\\\\b^2=\dfrac{160000}{441}+400\\\\b^2=\dfrac{160000}{441}+\dfrac{176400}{441}\\\\b^2=\dfrac{336400}{441}\to b=\sqrt{\dfrac{336400}{441}}\\\\b=\dfrac{\sqrt{336400}}{\sqrt{441}}\\\\b=\dfrac{580}{21}

3 0
3 years ago
I need help, I don’t understand.
Sergeeva-Olga [200]

Answer:

angle 3 + angle 5 = 180°( co-interior angles)

120°+6x=180°

6x=60°

x=10°

therefore, angle 5= 6x=6×10°=60°

5 0
3 years ago
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Answer:

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Step-by-step explanation:

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