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AnnyKZ [126]
3 years ago
14

Answer -7 x (-9) = ?Thank You!

Mathematics
1 answer:
artcher [175]3 years ago
5 0
   <span>-7 x (-9) = +63  

because  if we multiply  negative by negative we obtain +</span>
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Leo bought a bulldozer for $63,103. The value of the bulldozer depreciated at a constant rate per year. The table below shows th
fomenos
Year 1
58054.76=63,103(1-r)^1
Year 2
53,410.38=63103(1-r)^2
5 0
3 years ago
Read 2 more answers
A telemarketer is successful at getting people to donate money for her organization in 55% of all calls she makes. She must get
Tems11 [23]
An interesting twist to a binomial distribution problem.

Given:
p=55%=0.55 for probability of success in solicitation
x=4=number of successful solicitations
n=number of calls to be made
P(x,n,p)>=89.9%=0.899  (from context, it is >= and not =, which is almost impossible)

From context of question, all calls are assumed independent, with constant probability of success, so binomial distribution is applicable.

The number of successes, x, is then given by
P(x)=C(n,x)p^x(1-p)^{n-x}where
p=probability of success
n=number of trials
x=number of successesC(n,x)=\frac{n!}{x!(n-x)!}

Here we need n such that
P(x,n,p)>=0.899
given
x>=4, p=0.55, which means we need to find

Method 1: if a cumulative binomial distribution table is available, we can look up n=9,10,11 and find
P(x>=4,9,0.55)=0.834
P(x>=4,10,0.55)=0.898
P(x>=4,11,0.55)=0.939
So she must make (at least) 11 calls to make sure the probability of meeting her quota is 89.9% or more.

Method 2: using technology.
Similar to method 1, we can look up the probabilities directly, for n=9,10,11
P(x>=4,9,0.55)=0.834178
P(x>=4,10,0.55)=0.8980051
P(x>=4,11,0.55)=0.9390368

Method 3: using simple calculator
Here we need to calculate the probabilities for each value of n=10,11 and sum the probabilities of FAILURE S=P(0,n,0.55)+P(1,n,0.55)+P(2,n,0.55)+P(3,n,0.55)
so that the probability of success is 1-S.
For n=10,
P(0,10,0.55)=0.000341
P(1,10,0.55)=0.004162
P(2,10,0.55)=0.022890
P(3,10,0.55)=0.074603
So that
S=0.000341+0.004162+0.022890+0.074603
=0.101995
and Probability of getting 4 successes (or more) 
=1-S
=0.898005, missing target by 0.1%

So she will have to make 11 phone calls, bring up the probability to 93.9%.  The work is similar to that of n=10.
8 0
3 years ago
lilah's band had practiced 24 songs. at a performance, they played 7 songs in their first set and 8 in their second set. how man
Anastaziya [24]
8 songs.
[24-(8+7)]-1=8
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Please help me!! ASAP it’s timed !! Thank you
atroni [7]

Answer:

no, no, yes, yes

Step-by-step explanation:

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3 years ago
The value of a share of stock in an electronics company increased by 2/3% during one week . IF the value of a share stock was $1
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There should be a .94 increase making it be 141.94 at the end of the week.
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