Need Help ASAP !!!!!!

Mathematics

2 answers:

inysia [295]3 years ago

5 0

Answer:

9/20 like i said

Step-by-step explanation:

use symbolab

lara31 [8.8K]3 years ago

3 0

if you in you computer you can use math/way

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The price of a cellular telephone plan is based on peak and nonpeak service. Kelsey used 45 peak minutes and 50 nonpeak minutes

Oxana [17]

We can build a system of two linear equations with two unknowns with the info provided in the problem, one with Kelsey info and one with Mitch info like so:
Lets call p the amount on peak minutes and n the amount of non-peak minutes:
45p + 50n = 27.75
70p + 30n = 36
lets reduce the equations dividing the first by 5:
9p + 10n = 5.55
70p + 30n = 36
now, to eliminate n, lets multiply the first equation by -3 and add the two equations:
-27p - 30n = -16.65
70p + 30n = 36
----------------------------
43p + 0 = 19.35
p = 19.35/43
p = 0.45
therefore the peak rate is $0.45 per minute
lets substitute in one of the original equations this result:
45p + 50n = 27.75
45(0.45) + 50n = 27.75
20.25 + 50n = 27.75
50n = 27.75 - 20.25
50n = 7.5
n = 7.5/50
n = 0.15
therefore the non-peak rate per minute is $0.15

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3 years ago

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EleoNora [17]

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then you subtract 195 from 90
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2 years ago

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