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Lina20 [59]
3 years ago
8

A math class has 9 girls and 1 boy in the seventh grade and 3 girls and 3 boys in the eighth grade. The teacher randomly selects

a seventh grader and an
eighth grader from the class for a competition. What is the probability that the students she selects are both boy?
Mathematics
2 answers:
GrogVix [38]3 years ago
6 0

Answer:

Step-by-step explanation:

prob(boy 7th grade)= 1/10  it is just one boy out of 10 students

prob(boy 8th grade)= 3/6=1/2  there are 3 boys out of 6 students

Prob(both boys)=( 1/10)*(1/2)=1/20

siniylev [52]3 years ago
4 0

Answer:

10% of choosing a 7th grade boy.

50% of choosing 8th grade boy

Step-by-step explanation:

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The volume of a spherical sculpture is 256 ft³. Rhianna wants to estimate the surface area of the sculpture. To do the estimate,
Brrunno [24]

Answer:

192 ft^2

Step-by-step explanation:

Given that

Volume of spherical sculpture = 256 ft³

\pi is used as 3.

To find:

Surface area of sculpture = ?

Solution:

First of all, let us learn about the formula for Volume and Surface Area of Sphere:

1. Volume =\frac{4}{3}\pi r^3

2. Surface\ Area = 4\pi r^2

Given volume is 256 ft³.

256 = \dfrac{4}{3}\pi r^3\\\Rightarrow 256 = \dfrac{4}{3}\times 3 r^3\\\Rightarrow 256 = 4 r^3\\\Rightarrow r^3=64\\\Rightarrow \bold{r = 4\ ft}

Now, let us put r = 4 in the formula of Surface Area to find the value of Surface Area:

Surface\ Area = 4\pi 4^2 = 4 \times 3 \times 16 = \bold{192\ ft^2}

So, approximate surface area of sculpture is 192 ft^2.

3 0
3 years ago
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eimsori [14]

Answer:

What day heck are you learning?! I have tried doing this my brain hurts sorry bro

Step-by-step explanation:

8 0
3 years ago
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joja [24]

Answer:

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Step-by-step explanation:

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5 0
3 years ago
he school has 800 students with 20 students on the gymnastic team and 10 students on the chess team (including 3 students who ar
Helga [31]
There are 17 members who are only in gymnastics, 7 who are only in chess, and 3 who are in both.
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Delvig [45]

Answer:

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Step-by-step explanation:

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