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15.07.2019 •
Mathematics
In 1985, the cost of clothing for a certain family was $620. in 1995, 10 years later, the cost of clothing for this family was $1,000. assuming the cost increased linearly, what was the cost of this family’s clothing in 1991?
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Ответ:
The cost of this family’s clothing in 1991 is $ 848.
Step-by-step explanation:
Given,
The cost of clothing is increasing linearly,
Let the equation that represent the cost of clothing ( in dollars ) after x years since 1985,
y = mx + c
Given, for x = 0, y = 620,
⇒ 620 = m(0) + c
⇒ c = 620,
The number of years from 1985 to 1995 = 10 years,
So, if x = 10, y = 1000,
1000 = 10(m) + c
1000 = 10m + 620
380 = 10m
⇒ m = 38,
Hence, the function that represents the cost of clothing would be,
y = 38x + 620
If x = 6,
y = 38(6) + 620 = 848
Therefore, the cost of this family’s clothing in 1991 is $ 848.
Ответ:
C. Yes; he will practice a total of 2 7 12 hours, and 2 7 12 > 2 1 2 .
Step-by-step explanation: