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bezimeni [28]
3 years ago
12

Mr. Osborne needs two students to help him with a demonstration. He decides to draw two names out of a bag to make things fair.

There are 9 girls and 12 boys in his class. What is the probability that he draws the names of two boys?
Mathematics
2 answers:
Vladimir79 [104]3 years ago
8 0
Yes thrust if forest
Dovator [93]3 years ago
8 0
Answer: 2/21

Number chosen out of the total in the set.
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I need help with this question:
SpyIntel [72]

Answer:

2,406.16452 cm

Step-by-step explanation:

(1/3)*(17.2*17.2)*24.4

98.61333*24.4

2,406.16452cm

7 0
3 years ago
Find the total area the regular pyramid.
Ber [7]

Answer: 14\sqrt{3}

Step-by-step explanation:

1. You must apply the following formula for calculate  the total surface area the regular pyramid:

SA=\frac{pl}{2}+B

Where p is the perimeter of the base, l is the slant height and B is the area of the base.

2. The perimeter is, where s is the side length:

p=3s=3*4=12

3. The faces are isosceles traingles. So, to find the slant height you can divide one base into two equal right triangles and calculate the slant height with Pythagorean Theorem:

l=\sqrt{4^2-2^2}=2\sqrt{3}

4. The base is equal to any face, then both have equal areas. As previously you divide one base into two equal righ triangle to find the slant height, you can calcualte the area of one right triangle and multply it by 2 to calculate B:

B=2*\frac{bh}{2}=2*\frac{2\sqrt{3}}{2}=2\sqrt{3}

Finally substitute values:

SA=\frac{12*2\sqrt{3}}{2}+2\sqrt{3}=14\sqrt{3}

6 0
2 years ago
Read 2 more answers
A cube has a side length of x inches. What expression represents the total volume, in cubic inches, of the cube?
Pie

Answer:

Volume = x^3 cubic inches

Step-by-step explanation:

A cube is the 3D version of a square. Since one side length is x inches, all the other side lengths are same, x inches each.

We know,

Volume = area of base * height

THe base is a square and the area is side * side. We know each side is x, so we have:

Area of Square = Area of Base = x * x = x^2

Now, we know height is also same side length, x, thus the volume becomes:

Volume = area of base * height

Volume = x^2*x

We add the exponents when we have same base multiplied, so the expression for volume becomes:

Volume = x^2*x=x^3

8 0
3 years ago
Caroline’s hair is 7 inches long and grows about ⅕ inch each month. Trinity’s hair is 10 inches long and grows about 1/10 inch e
sashaice [31]
B
I know this right away because notice how it says “EACH month.” When it includes each you have to have an “x” beside the number to make it each month. If you don’t have an x it will just be “a single month.”

Sorry if that’s confusing I’m bad at explaining but have a nice day:))
7 0
3 years ago
HELP!!
Kazeer [188]

Answer:

(D)Lucita's estimate is too high.

6 0
3 years ago
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