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2 years ago

Please help! Solve the following:

Mathematics

1 answer:

mihalych1998 [28]2 years ago

4 0

Answer:

n=10.

Step-by-step explanation:

$\frac{45}{n^{2}-3n-4 }$ - $\frac{3}{n-4}$ = $\frac{2}{n+1 }$

$\frac{45}{n^{2}-3n-4 }$ - $\frac{3(n+1)}{(n+1)(n-4)}$ = $\frac{2(n-4)}{(n+1)(n-4) }$

$\frac{45}{n^{2}-3n-4 }$ - $\frac{3n+3}{n^{2} -3x-4}$ = $\frac{2n-8}{n^{2} -3x-4 }$

45-3n-3=2n-8

45-3+8=5n

n=50/5=10

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The temperature was -13 and then rose 9. What is the temperature now?

gulaghasi [49]

Answer:

-4

Step-by-step explanation:

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2 years ago

Find a rational number that is between 7.7 and 7.9. Explain why it is rational

Sophie [7]

There are a lot of rational number between 7.7 and 7.9, but the problem asked to find only one ratio number, so I will choose one which is 7.8. 7.8 is a rational number because ration number means that it can change into a fraction or improper fraction.
Now, let's change 7.8 into the fraction
First of all, change this into mixed number:
7.8
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Step 1:
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3 years ago

Read 2 more answers

A scuba diver returning to the surface swims to move up quickly, then waits a few meters below the surface to avoid pressure iss

Juliette [100K]

Given:

The function f represents the diver's distance from sea level over time, in seconds.

$f(x)=\begin{cases}3x+1 & \text{ if } -9$

To find:

The correct statement for the domain.

Solution:

Domain is the set of input values for which the function is defined.

Here, x values are the input values and they represent time intervals on which the function is defined

Here, the possible intervals for x are $-9$ .

$Domain=(-9,-2]\cup (-2,1]\cup (1,7)$

$Domain=(-9,7)$

Therefore, the domain is the time interval (−9, 7). Hence the correct option is A.

4 0

2 years ago

You are preparing to paint a grain silo. The silo is a 20-foot tall cylinder with a circumference of 147 feet. One gallon of pai

Over [174]

Answer:

The answer to your question is 9 gallons

Step-by-step explanation:

Data

height = 20 ft

perimeter = 147 ft

1 gallon covers 300 ft²

paint = ?

Formula

Area of a cylinder = 2πrh + πr²

2πr = 147 ft

r = ?

Process

1.- Calculate the radius

2πr = 147

r = 147/2π

r = 23.4 ft

2.- Substitution

Area of the cylinder = 147(20) + 3.14(23.4)²

3.- Simplification

Area of the cylinder = 940 + 1719.33

Area of the cylinder = 2659. 33 ft²

4.- Divide the area of the cylinder by the area a gallon can cover.

Number of gallons = 2659.33/300

= 8.86 ≈ 9

3 0

2 years ago

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Answer:

Step-by-step explanation:25-10.81=14.19

he doesn't have enough to set aside for his lunch.

How can he buy any peanuts? he is broke

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2 years ago