3 years ago

Jenny is 12 years older than Nancy. Five years ago Jenny was three times as old as Nancy. How old is each now?

Mathematics

1 answer:

mote1985 [20]3 years ago

8 0

Answer:

Jenny = 23 | Nancy = 11

Step-by-step explanation:

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Modeling the number of transport bus breakdowns in every month to determine if an additional bus should be purchased. The runnin

skelet666 [1.2K]

Answer:

The probability of exactly 2 breakdowns next month = 0.08422

Step-by-step explanation:

To calculate the probability of exactly 2 breakdowns next month, we use Poisson distribution formula.

P(X = x) = (e^-λ)(λˣ)/x!

Mean = λ = 5 breakdowns per month

x = 2 breakdowns per month

P(X = 2) = (e⁻⁵)(5²)/2!

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3 years ago

A circle in the XY-plane has center (5, 7) and radius 2. Which of the following is an equation of the circle?

MAXImum [283]

Answer: A, because the equation of a circle is $(x-h)^2+(y-k)^2=r^2$ . So, if the point of the center is $(5,7)$ and the radius $2$ , then on the equation should be changed as negative and the radius should be multiplied as $4$ , which is $(x-5)^2+(y-7)^2=4$