How to multiply 216 ×39 by showing your work

Mathematics

2 answers:

Natasha_Volkova [10]3 years ago

7 0

Answer:

first, you set it up like this 216

step 2 is that you mutlply the 9 and 6 the 9 and 1 and the 9 with 2

after that then you add a 0 at the bottom and mutiply 3 and 6 3 and 1 and 3 and 2 once you do all of that then your answer should be 8,424

Step-by-step explanation:

statuscvo [17]3 years ago

4 0

Answer:

8424

Step-by-step explanation:

216 + 216 + 216 + 216 + 216 + 216 + 216 + 216 + 216 + 216 + 216 + 216 + 216 + 216 216 + 216 + 216 + 216 + 216 + 216 + 216 + 216 + 216 + 216 + 216 + 216 + 216 + 216 216 + 216 + 216 + 216 + 216 + 216 + 216 + 216 + 216 + 216 + 216 = 8424

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Suppose the time a child spends waiting at for the bus as a school bus stop is exponentially distributed with mean 7 minutes. De

Gala2k [10]

Answer:

The probability that the child must wait between 6 and 9 minutes on the bus stop on a given morning is 0.148.

Step-by-step explanation:

Let the random variable X represent the time a child spends waiting at for the bus as a school bus stop.

The random variable X is exponentially distributed with mean 7 minutes.

Then the parameter of the distribution is, $\lambda=\frac{1}{\mu}=\frac{1}{7}$ .

The probability density function of X is:

$f_{X}(x)=\lambda\cdot e^{-\lambda x};\ x>0,\ \lambda>0$

Compute the probability that the child must wait between 6 and 9 minutes on the bus stop on a given morning as follows:

$P(6\leq X\leq 9)=\int\limits^{9}_{6} {\lambda\cdot e^{-\lambda x}} \, dx$

$=\int\limits^{9}_{6} {\frac{1}{7}\cdot e^{-\frac{1}{7} \cdot x}} \, dx \\\\=\frac{1}{7}\cdot \int\limits^{9}_{6} {e^{-\frac{1}{7} \cdot x}} \, dx \\\\=[-e^{-\frac{1}{7} \cdot x}]^{9}_{6}\\\\=e^{-\frac{1}{7} \cdot 6}-e^{-\frac{1}{7} \cdot 9}\\\\=0.424373-0.276453\\\\=0.14792\\\\\approx 0.148$