A square pyramid is called like so because its base is a square.
notice this one, its base is a 0.4x0.4 square, and the triangular faces have a base of 0.4 and an altitude or height of 5.
so we can simply get the area of the base and all four triangular faces and sum them up, and that's the surface area of the pyramid.
The expected number of female children in a family with three children is 1.5.
The correct option is B.
We have to determine
What is the expected number of female children in a family with three children?
<h3>Probability;</h3>
Probability is defined as the sum of all observations and the number of observations.
The expected value of female children= Probability of female children x Total number of children.
A child can be male or female, so there are 2 combinations, the favorable outcome is female.
The probability of female children = 1/2.
Therefore,
The expected number of female children in a family with three children is;
Hence, The expected number of female children in a family with three children is 1.5.
To know more about probability click the link given below.
brainly.com/question/743546
Answer:
Bagel = $0.80; Muffin = $1.25
Step-by-step explanation:
Since there are two variables (cost of a bagel and cost of a muffin) and two different sets of data, setting up a system of equations and using elimination to solve for one of the variables will give the answer to both variables.
'10 bagels and 4 muffins cost $13': 10b + 4m = 13
'5 bagles and 8 muffins cost $14': 5b + 8m = 14
In order to use eliminate one of the variables when adding the two equations together, we need to multiply the second equation by a factor of '-2':
-2(5b + 8m = 14) or -10b - 16m = -28
+ <u>10b + 4m = 13</u>
-12m = -15
m = $1.25
Solve for 'b': 10b +4(1.25) = 13 or 10b + 5 = 13
10b = 8 or b = $0.80
So, the cost of one bagel = $0.80 and the cost of one muffin = $1.25.
D would be the right answer
Answer:
2√(5/π) ≈ 2.523
Step-by-step explanation:
The radius can be found using the area formula:
A = πr²
20 = πr² . . . . . fill in the given value
20/π = r² . . . . . divide by π
√(20/π) = r = 2√(5/π) . . . take the square root and simplify
You can use your calculator to find a numerical value for this:
r = 2√(5/π) ≈ 2.52313
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<em>Comment on the form of the answer</em>
Radicals are often considered to be in simplest form when they do not contain fractions or square factors. Here, the "simpler" form would be ...
r = (2/π)√(5π)
involving the irrational number π in two calculations. My preference for evaluating the expression for r is to leave it as √(20/π) or 2√(5/π).