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3 years ago

13

Miss Brown will randomly choose a student in justin's class to erase the board. There are 26 students in the class. What is the

probability that Ms. Brown with choose justin to erase the board 2 days in a row?
A: 1%

B: 10%

C: 0.1%

D: 8%

2 answers:

sergejj [24]3 years ago

5 0

Answer:

1%?

Step-by-step explanation:

Dima020 [189]3 years ago

3 0

Answer:

B

Step-by-step explanation:

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Classify the shapes based on their volumes.

shepuryov [24]

Answer:

1. volume of cone = 288π cube units

2. volume of cylinder = 972π cube units

3. volume of sphere = 288π cube units

4. volume of cylinder = 288π cube units

5. volume of sphere = 972π cube units

6. volume of cone = 972π cube units

Step-by-step explanation:

1. Radius of cone (r) = 12units

height of cone(h) = 6units

volume of cone = π/3r²h

=π/3.12.12.6

=π.12.12.2

=288π cube units

2. diameter of cylinder(d) = 12units

radius of cylinder (r) = 6units

height of cylinder (h) = 27 units

volume of cylinder = πr²h

= π.6.6.27

= 972π cube units

3. diameter of sphere = 12 units

radius of sphere = 6 units

volume of sphere = 4π/3.r³

= 4π.2.6.6

= 288π cube units

4. diameter of cylinder (d) = 8 units

radius of cylinder (r) = 4 units

height of cylinder(h) = 18units

volume of cylinder = πr²h

= π.4.4.18

= 288π cube units

5. radius of sphere(r) = 9 units

volume of sphere = 4π/3.r³

= 4π/3.9.9.9

= 4π.3.9.9

= 972π cube units

6. diameter of cone (d) = 18 units

radius of cone (r) = 9 units

height of cone (h) = 36 units

volume of cone = π/3.r².h

= π/3.9.9.36

= π.3.9.36

=972π cube units

4 0

3 years ago

Last year at a certain high school, there were 50 boys on the honor roll and 100 girls

Sedbober [7]

there were 145 boys on the honor role and 60 girls equally given a total number of 205. This year, the number of boys decreased by 20% = 0.2*145=29

145-29=116

116 is this year number of boys on honor role

For girls.

=0.25*60=15

60-15=45

45 is this year number of girls on honor role.

Total number of students on honor role this year is 116+45 =161

Percentage of decrease = 1 -(161/205)*100% =( 1-0.785)*100

= 0.215*100

= 21.5%

3 0

3 years ago

Read 2 more answers

10x - 5y = -25<br> l0x+8y=14

balandron [24]

Greetings,

<em>I hope you and your family are staying safe and healthy! </em>

Answer: x = -1 and y = 3

Step-by-step explanation:

$10x - 5y = -25 \\10x + 8y = 14$

Let's start by solving $10x - 5y = -25$ for $x$

$10x - 5y=-25$

Add 5y to both sides

$10x - 5y + 5y = -25+5y \\10x = 5y - 25$

Now we need to divide both sides by 10

$\frac{10x}{10} = \frac{5y-25}{10}$

$x = \frac{1}{2} y + \frac{-5}{2}$

That's not the answer for x. We are not done yet :)

Now we need to substitute $\frac{1}{2} y + \frac{-5}{2}$ for $x$

$10x + 8y = 14\\10(\frac{1}{2} y + \frac{-5}{2} + 8y = 14$

Now we need to simply both sides

$13y - 25 = 14$

Now we need to add 25 to both sides

$13y - 25 + 25 = 14 + 25 \\13y = 39 \\y = \frac{39}{13} \\y=3$

We have the valuee for y! Now we need to find the value for x

To find the value of x, we need to substitute 3 for y in:

$x = \frac{1}{2} y + \frac{-5}{2} \\x = \frac{1}{2} 3 + \frac{-5}{} \\x = -1$

Therefore,

The answer is x = -1 and y = 3

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3 0

3 years ago

10% of 1200 is what number?<br> Step by step please

sdas [7]

120
Step by step explanation:
Divide 1200 by 10
That equals 120
You can back check by multiplying 120 by 10

5 0

2 years ago

Read 2 more answers

What type of triangle is triangle ABC give reasons for your answer help please I need 1 more mark But I don't know what I'm doin

ladessa [460]

Answer: isosceles

Step-by-step explanation:

By the alternate interior angles theorem, $\angle CAB=50^{\circ}$

Since angles in a triangle add to 180 degrees, $\angle ACB=180^{\circ}-80^{\circ}-50^{\circ}=50^{\circ}$

Since sides opposite equal angles in a triangle are equal, $AB=BC$ .

So, triangle ABC is <u>isosceles</u>

7 0

2 years ago