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kari74 [83]
3 years ago
15

A pentomino is made up of five squares where two squares are joined along an entire side. Two pen- tominos are the same if they

can be matched by turning or flipping. How many different pentomino shapes are possible?

Mathematics
1 answer:
Studentka2010 [4]3 years ago
5 0

There are 12 such shapes. One can start with two squares, adding squares around the edge and rejecting shapes that have been previously seen. Repeating until you have 5 squares results in 12 distinct shapes.

_____

2 shapes are possible with 3 squares: L, I

5 shapes are possible with 4 squares: L, I, N, T, O

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If the number is divisible both 3 and 4, find the greatest common fact
madam [21]
12 | 3*4=12 therefor any number that is divisible by 3 and 4 is also divisible by 12
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What percent of 33.5 is 21
zysi [14]
Take the number "of" divided by the other number then multiply it by 100% to get the percentage.
(21/33.5) ×100%= 62%
6 0
3 years ago
an initial deposit of $200 is made into an account that pays 4.2% annual interest. What is a model to represent the balance in t
Sholpan [36]
You would use the equation y = A(1+r)^t 

A = Original amount = 200
r = interest rate = 0.042 (when converted from percent to decimal)
t = time = x 

Plug them in and you get the model: y = 200(1+0.042)^x 

or just simplify the parentheses to (1.042)
5 0
3 years ago
Find the equation of the circle: y-intercepts 4 and –8, contain (–12, –8)
laila [671]

Answer:

  (x +6)^2 +(y +2)^2 = 72

Step-by-step explanation:

The given points are vertices of a right triangle. The circle circumscribing that triangle (through all 3 vertices) will have its center at the midpoint of the hypotenuse:

  ((0, 4) +(-12, -8))/2 = (-6, -2)

The equation of a circle with center (h, k) through point (a, b) is ...

  (x -h)^2 +(y -k)^2 = (a -h)^2 +(b -k)^2

For center (-6, -2) and point (0, 4), the equation is ...

  (x +6)^2 +(y +2)^2 = (0+6)^2 +(4 +2)^2

  (x +6)^2 +(y +2)^2 = 72

6 0
3 years ago
A human gene carries a certain disease from the mother to the child with a probability rate of 34%. That is, there is a 34% chan
eimsori [14]

Answer:

The probability that at least one of the children get the disease from their mother is P=0.7125.

Step-by-step explanation:

This can be modeled as a binomial random variable.

The parameter p=0.34 is the probability of a child being infected, and is constant and independent of the other events.

The parameter n=3 is the number of children  (sample size).

Then, we have to calculate the probabilty that at least one of the children get the disease from their mother. That is:

P(x\geq1)

The probability of exactly k children being infected can be calculated as:

P(x=k) = \dbinom{n}{k} p^{k}(1-p)^{n-k}

Then, the easiest way to calculate this probability is using the complement: the value of the probability is 1 (or 100%) less the probability that no children gets infected.

P(x\geq1)=1-P(x=0)\\\\\\P(x=0) = \dbinom{3}{0} p^{0}(1-p)^{3}=1*1*0.2875=0.2875\\\\\\P(x\geq1)=1-0.2875=0.7125

3 0
3 years ago
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