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leonid [27]
3 years ago
12

Which of these equations correctly represents the following scenario: In her prime, 40 million people knew who Britney Spears wa

s, but that number has been decreasing by 10% each year. So, since 90% of people still recognize her each year, how many people still know who Britney is each year?
y = 40,000,000(0.9)x


y = 0.9(40,000,000)x


y = 40,000,000(0.01)x



y = 0.1x + 40,000,000


y = 0.01(40,000,000)x
Mathematics
1 answer:
SVETLANKA909090 [29]3 years ago
3 0

Answer:

Its the first option

40,000,000(0.9)x.

Step-by-step explanation:

90% recognise her each year so after 1 year so the number (N) is:

N = 40,000,000(0.90)^1 = 36,000,000 recognise her after 1 year.

N = 40,000,000(0.90)^2 = 32,400,000 recognise her after 2 yeas

- and so on.

After x years:

N = 40,000,000(0.90)^x.  

Note the x is a power and is best written as ^x.

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The first step for solving this expression is to reduce the fraction with 11.
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3 years ago
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A concrete slab 4 inches deep will be poured for the floor of greenhouse A. How many cubic feet of concretar are needed for the
Mars2501 [29]

This question is incomplete

Complete Question

Consider greenhouse A with floor dimensions w = 16 feet , l = 18 feet.

A concrete slab 4 inches deep will be poured for the floor of greenhouse A. How many cubic feet of concrete are needed for the floor?

Answer:

96 cubic feet

Step-by-step explanation:

The volume of the floor of the green house = Length × Width × Height

We convert the dimensions in feet to inches

1 foot = 12 inches

For width

1 foot = 12 inches

16 feet = x

Cross Multiply

x = 16 × 12 inches

x = 192 inches

For length

1 foot = 12 inches

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Cross Multiply

x = 18 × 12 inches

x = 216 inches

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Hence,

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From cubic inches to cubic feet

1 cubic inches = 0.000578704 cubic foot

165888 cubic inches = x

Cross Multiply

x = 16588 × 0.000578704 cubic foot

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Solve for h:
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