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3 years ago

(x+3)(x-5)=? im having issues with this

Mathematics

1 answer:

MissTica3 years ago

3 0

Answer:

$x^2-2x-15$ is the expanded form.

Step-by-step explanation:

We can expand these brackets to give us this equation.

$(x+3)(x-5)=x^2+3x-5x-15\\x^2-2x-15$

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The time between telephone calls to a cable television service call center follows an exponential distribution with a mean of 1.

Ulleksa [173]

Answer:

0.52763 is the probability that the time between the next two calls will be 54 seconds or less.

0.19285 is the probability that the time between the next two calls will be greater than 118.5 seconds.

Step-by-step explanation:

We are given the following information in the question:

The time between telephone calls to a cable television service call center follows an exponential distribution with a mean of 1.2 minutes.

The distribution function can be written as:

$f(x) = \lambda e^{-\lambda x}\\\text{where lambda is the parameter}\\\\\text{Mean} = \mu = \displaystyle\frac{1}{\lambda}\\\\\Rightarrow 1.2 = \frac{1}{\lambda}\\\\\lambda = 0.84 \\f(x) = 0.84 e^{0.84 x}$

The probability for exponential distribution is given as:

$P( x \leq a) = 1 - e^{\frac{-a}{\mu}}\\\\P(a \leq x \leq b) = e^{\frac{-a}{\mu} -\frac{-b}{\mu}}$

a) P( time between the next two calls will be 54 seconds or less)

$P( x \leq 0.9)\\= 1 - e^{\frac{\frac{-54}{60}}{1.2}} = 0.52763$

0.52763 is the probability that the time between the next two calls will be 54 seconds or less.

b) P(time between the next two calls will be greater than 118.5 seconds)

$p( x > \frac{118.5}{60}) = P(x > 1.975)\\\\ = 1 - P(x \leq 1.975) \\\\= 1 -1+ e^{\frac{-1.975}{1.2}}\\\\= 0.19285$

0.19285 is the probability that the time between the next two calls will be greater than 118.5 seconds.

6 0

3 years ago

What is .133 repeating as a fraction?

mihalych1998 [28]

.13333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333

6 0

3 years ago

Read 2 more answers

The radius of a garden in the shape of a regular pentagon is 18 feet. Find the area of the garden

bonufazy [111]

Think and do the math take your time

5 0

3 years ago

SOOO this jejwijsnxnJjxnndjjs

Tcecarenko [31]

Answer:

Step A) 250 times 3 months + 500 cause you already have that in your bank account= 1250

Step B) 12+12=24 so 250 times 24=6000+ 500 cause you already have that in your bank account= 6500

Step C) 8,300- 6500= 1800 then, 250 time 5 + 500= 1750, and 250 times 6 = 1500+500=2000 so you can go with whatever.

Step D) 3 years= 36 months so 250 times 36 months= 9000 so in three yrs you should have about 9500 bc you need to add the 500 on again. sry I could not do the graph but I hoped I helped. :)

Step-by-step explanation:

8 0

3 years ago

Can anybody help me with this?

mihalych1998 [28]

Answer:

Cost = 17.08

Step-by-step explanation:

The cost is 4.88 per pound.

We buy 3.5 pounds

Cost = number of pounds * cost per pound

Cost = 3.5 * 4.88

Cost = 17.08

6 0

3 years ago