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zhuklara [117]
3 years ago
6

Oceanside Bike Rental Shop charges an initial fee of 15 dollar plus 7 dollars an hour for renting a bike. Joan paid 57 dollars t

o rent a bike. How many
hours did she pay to have the bike checked out?
Mathematics
1 answer:
dlinn [17]3 years ago
6 0

Answer:

6

Step-by-step explanation:

57=15+7x --> 57-15=7x --> 42=7x --> 42/7=x --> 6

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15) The sum of one-fourth, one-ninth and one- third of a number is 25. Find the number.​
klio [65]

Answer:

Step-by-step explanation:

(1/4 + 1/9 + 1/3)x = 25.

x = 36

7 0
3 years ago
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What i 12% of 32? is 32the part or the whole???
Valentin [98]
32 is the whole 12.16 is 12 percent of 32
7 0
3 years ago
For a binomial distribution with p = 0.20 and n = 100, what is the probability of obtaining a score less than or equal to x = 12
notsponge [240]
The binomial distribution is given by, 
P(X=x) =  (^{n}C_{x})p^{x} q^{n-x}
q = probability of failure = 1-0.2 = 0.8
n = 100
They have asked to find the probability <span>of obtaining a score less than or equal to 12.
</span>∴ P(X≤12) = (^{100}C_{x})(0.2)^{x} (0.8)^{100-x}
                    where, x = 0,1,2,3,4,5,6,7,8,9,10,11,12                  
∴ P(X≤12) = (^{100}C_{0})(0.2)^{0} (0.8)^{100-0} + (^{100}C_{1})(0.2)^{1} (0.8)^{100-1} + (^{100}C_{2})(0.2)^{2} (0.8)^{100-2} + (^{100}C_{3})(0.2)^{3} (0.8)^{100-3} + (^{100}C_{4})(0.2)^{4} (0.8)^{100-4} + (^{100}C_{5})(0.2)^{5} (0.8)^{100-5} + (^{100}C_{6})(0.2)^{6} (0.8)^{100-6} + (^{100}C_{7})(0.2)^{7} (0.8)^{100-7} + (^{100}C_{8})(0.2)^{8} (0.8)^{100-8} + (^{100}C_{9})(0.2)^{9} (0.8)^{100-9} + (^{100}C_{10})(0.2)^{10} (0.8)^{100-10} + (^{100}C_{11})(0.2)^{11} (0.8)^{100-11} + (^{100}C_{12})(0.2)^{12} (0.8)^{100-12}


Evaluating each term and adding them you will get,
P(X≤12) = 0.02532833572
This is the required probability. 
7 0
3 years ago
One clay brick weighs 5.76 pounds. The brick is 8 inches long and 2 1/4 inches wide. If the clay weighs 0.08 pounds per cubic in
IgorLugansk [536]
Yess yess yess 5.76 si right


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Katarina [22]

Answer:

  1. This might help a liitle its kind of like the question you are asking.
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Step-by-step explanation:

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