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Scilla [17]
4 years ago
8

Selena's family went on a trip. The total hotel bill was $659 . The cost of the airfare was $633. use mental math to find the to

tal cost for the hotel and the airfare.
Mathematics
2 answers:
noname [10]4 years ago
6 0
Basically add the numbers in your head starting from right to left.line up the numbers...659
+633
9+3=12
5+3+1(because we borrowed 1)
=9
6+6=12
Anwser 1299
Vilka [71]4 years ago
4 0
659+633

=1292

hope this helps
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Which set of expressions represents three consecutive integers?
Svetlanka [38]
D, as it increases by one
4 0
3 years ago
The commute time for people in a city has an exponential distribution with an average of 0.5 hours. What is the probability that
mamaluj [8]

Answer:

0.314 = 31.4% probability that a randomly selected person in this city will have a commute time between 0.4 and 1 hours

Step-by-step explanation:

Exponential distribution:

The exponential probability distribution, with mean m, is described by the following equation:

f(x) = \mu e^{-\mu x}

In which \mu = \frac{1}{m} is the decay parameter.

The probability that x is lower or equal to a is given by:

P(X \leq x) = \int\limits^a_0 {f(x)} \, dx

Which has the following solution:

P(X \leq x) = 1 - e^{-\mu x}

The probability of finding a value higher than x is:

P(X > x) = 1 - P(X \leq x) = 1 - (1 - e^{-\mu x}) = e^{-\mu x}

In this question:

m = 0.5, \mu = \frac{1}{0.5} = 2

What is the probability that a randomly selected person in this city will have a commute time between 0.4 and 1 hours?

P(0.4 \leq X \leq 1) = P(X \leq 1) - P(X \leq 0.4)

In which

P(X \leq 1) = 1 - e^{-2} = 0.8647

P(X \leq 0.4) = 1 - e^{-2*0.4} = 0.5507

So

P(0.4 \leq X \leq 1) = P(X \leq 1) - P(X \leq 0.4) = 0.8647 - 0.5507 = 0.314

0.314 = 31.4% probability that a randomly selected person in this city will have a commute time between 0.4 and 1 hours

4 0
3 years ago
Simplify - 4 of u-2​
NISA [10]

Answer:

it's 30

Step-by-step explanation:

30+4_2= dakukabilat

4 0
3 years ago
Read 2 more answers
A skateboard halfpipe is being designed for a competition. The halfpipe will be in the shape of a parabola and will be positione
levacccp [35]

Answer:

Option A , (0, 20); y equals one over eighty times x squared plus 20

Step-by-step explanation:

 

The equation of parabola is given by  

(X-h)^2 = 4p(Y-k)^2

In this case h = 0  

So we get  

Y = X^2/4P +k

Focus point is (h, p+k) , p+k = 40  

Hence h, k = (0,20)

P = 40-k = 20

Equation Y = X^2/80 +20  

Hence, option A is correct

6 0
3 years ago
Por favor me ajuda<br> (Please Help Me)
Rainbow [258]

The missing number would be 100.

e.g 400/2= 200

200/2= 100

100/2 = 50

50/2 = 25

5 0
2 years ago
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