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3 years ago

Solve the Following expression d=5 2d+4d-9-7=

Mathematics

3 answers:

makkiz [27]3 years ago

7 0

Answer:

Step-by-step explanation:

d=5 so

2(5)+4(5)-9-7

10+20-9-7

30-9-7

21-7

inessss [21]3 years ago

7 0

Answer:

2×5+4×5-9-7.

10+20-9-7.

=14.

rewona [7]3 years ago

7 0

Answer:

2×5+4×5-9-7.

10+20-9-7.

=14.

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A pond has 150 fish and the population decreases by 8% each day. How many days before there are 30 fish

nlexa [21]

Answer:

19 days

Step-by-step explanation:

Given

$a = 150$ --- initial

$r = 8\%$ -- rate

Required

Days when the fish gets to 30

The function is exponential and as such it follows;

$y = ab^x$

Where x represents the number of days and y the number of fishes

Because the fishes decreases;

$b = 1 - r$

So, we have:

$b = 1 - 8\%$

Express as decimal

$b = 1 - 0.08$

$b = 0.92$

In $y = ab^x$

$a =150$

$y = 30$

$b = 0.92$

So, we have:

$30 = 150 * 0.92^x$

Divide both sides by 150

$0.2 = 0.92^x$

Take log of both sides

$log(0.2) = log(0.92^x)$

Apply law of logarithm

$log(0.2) = x\ log(0.92)$

Make x the subject

$x = \frac{log(0.2)}{log(0.92)}$

$x = \frac{-0.6990}{-0.0362}$

$x = 19.309$

$x \approx 19$

<em>Hence, it takes approximately 19 days</em>

3 0

3 years ago

Answer questions Correctly for brainly

morpeh [17]

Answer:

x= $\frac{13}{6}$

Step-by-step explanation:

2x +2/3=5

x=13/6

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3 years ago

Trim earnings 28.50 tutoring for 3hours write an equation relating her earnings m to the number of hours h she tutors assuming t

neonofarm [45]

Answer:

142

Step-by-step explanation:

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IrinaVladis [17]

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Step-by-step explanation:

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2 years ago

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kompoz [17]

Answer:

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Step-by-step explanation:

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2 years ago

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