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zvonat [6]
3 years ago
15

A service station has both self-service and full-service islands. On each island, there is a single regular unleaded pump with t

wo hoses. Let X denote the number of hoses being used on the self-service island at a particular time, and let Y denote the number of hoses on the full-service island in use at that time. The joint pmf of X and Y appears in the accompanying tabulation
Mathematics
1 answer:
Annette [7]3 years ago
8 0

Answer:

ANSWER LINK

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In certain county, the number of charter schools is 4 less than twice the numbervof alternative schools. We know that there are
Vitek1552 [10]
1. Let's call the number of carter school: "x" and "y" the number of alternative school.  Then, you have that:

 - T<span>he number of charter schools is 4 less than twice the number of alternative schools.
</span> - T<span>here are 48 charter schools in the country.

 2. So, you have:

 x=2y-4  (i)

 x=48  (ii)

 3. Then, when you substitute x=48 into the equation (i), you obtain:
</span>
 x=2y-4
<span> 48=2y-4

 4. Now, you must clear "y, as below:

 48+4=2y
 2y=52
 y=52/2
 y=26
 </span><span>
 How many alternative schools are in the county?
</span><span>
 The answer is: There are 26 alternative schools.</span>
6 0
3 years ago
When servicing a heating boiler and radiators, a plumber knows that the time
Elena L [17]
£110 as 45mins times 4 radiators divided by 60 mins =3 hours

3 hours + 1 hour = 4 hours
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£80+£30=£110
3 0
3 years ago
If there are 7 bolts in a widget and 6 widgets in an appliance, how many bolts are in 20 appliances?
sweet [91]
A single appliance has 6 widgets, and a widget has 7 bolts. Therefore, you need to multiply 6 by 7 to find the number of bolts in a single appliance.

6 x 7 = 42

Now that you know the number of bolts in an appliance, you can find the number of bolts in 20 appliances by multiplying 42 by 20.

42 x 20 = 840

Hence, there are 840 bolts in 20 appliances.

5 0
3 years ago
If 6 out of 30 people over the age of 100 are male, how many are female
RoseWind [281]
The remainder of the thirty once you remove the 6 who are male.
30-6=24..
5 0
3 years ago
How do u round 23.897 to the nearst 9
Stella [2.4K]
Do you mean the nearest 10th
7 0
3 years ago
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