2 years ago

PLEASE HELP 40 POINTS pls answer the full question and show the process of how you found too NEED quick response.

Mathematics

1 answer:

Alex787 [66]2 years ago

6 0

Answer:

Step-by-step explanation:

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The cost of a High Definition television now averages $700, but the cost is decreasing about 15% per year. In how many years wil

Roman55 [17]

Answer: 7.7 years

Step-by-step explanation:

Given

The cost of HD TV is $700 and it is decreasing at the rate of 15% per year

After one year it becomes

$\Rightarrow 700-700\times 15\%\\\Rightarrow 700(1-0.15)$

after 2 year it becomes

$\Rightarrow 700(1-0.15)-700(1-0.15)\times 15\%\\\Rightarrow 700(1-0.15)(1-0.15)\\\Rightarrow 700(1-0.15)^2$

Suppose, after x years it becomes $200

$\Rightarrow 200=700(1-0.15)^x\\\\\Rightarrow \dfrac{2}{7}=0.85^x\\\\\text{Taking log both sides}\\\\\Rightarrow x=\dfrac{\ln (\frac{2}{7})}{\ln (0.85)}\\\\\Rightarrow x=7.7\ \text{years}$

Thus, it takes 7.7 years for the cost to come under $200.

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2 years ago

out of 200 houses in a neighborhood, 30 of them have their own lawn service. what percent of the houses do not have their own la

stira [4]

Answer:

85%

Step-by-step explanation:

If 30 of them have their own lawn service then that means 170 of them do not have their own lawn service.

Seeing as there are 200 houses in total, the fraction of people who don't have lawn service is 170/200. This is equal to 0.85 or 85%.

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3 years ago

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The equation d=3t represents the relationship between the distance (d) in inches that a snail is from a certain rock and the tim

cestrela7 [59]

Answer:

Speed

Step-by-step explanation:

To find the distance the formula is d=st. Where d is the distance, s is speed, and t is time. So in the equation, 3 must be the speed of the snail.

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3 years ago

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What is the answer for K ?

Norma-Jean [14]

10/3 = k/9

10 x 9 = 3 x k

90 = 3 k

k = 90/3

k = 30

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2 years ago

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One tray holds eight sandwiches. If there are 30 sandwiches in all how many trays are needed

astra-53 [7]

4 trays are needed because your number is 3.75 and you need another tray for the rest

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2 years ago