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3 years ago

Simplify the expression 7.8n²+0.5+9n-.0.4-7n+n²

Mathematics

2 answers:

charle [14.2K]3 years ago

8 0

Answer:

8.8n² + 2n + 0.1

Step-by-step explanation:

For this expression, all you have to do is combine like terms, which means to combine terms with n² with each other, terms with n with each other, and so on.

7.8n² + 0.5 + 9n - 0.4 - 7n + n²

Now, put the n² terms, n terms, and constants (no n) with each other.

7.8n² + n² + 9n - 7n + 0.5 - 0.4

Now you can add and subtract to combine like terms.

7.8n² + n² + 9n - 7n + 0.5 - 0.4

8.8n² + 2n + 0.1

And that's your answer.

Natali [406]3 years ago

4 0

The final answer for this question would be.....

8.8n^2+16n+0.1

Hope this helps!!!!

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Sara bought a car for $15700 with interest rate of 5 3/7% and the contract is for 7 years.

Svetlanka [38]

1. How much interest will Sara owe?

She will owe 5,966 dollars

2. How much will the payments be with a seven year agreement?

Sara will pay 21,666 dollars

<h2>Explanation:</h2>

The simple interest formula is as follows:

$A=P(1+rt) \\ \\ \\ Where: \\ \\ A: \ is \ the \ Final \ Investment \Value \\ \\ P: \ is \ the \ Principal \ amount \ of \ money \ to \ be \ invested \\ \\ r: \ is \ the \ rate \ of \ interest \\ \\ t: \ is \ \ Number \ of \ Time \ Periods$

First, converting r percent to r a decimal

$r = (5 \frac{3}{7})\%=(5+\frac{3}{7}))\%=\frac{38}{7}\% \\ \\ r=\frac{38/7}{100}=\frac{19}{350} \ per \ year$

Solving our equation:

$A=15700 (1+\frac{19}{350}\times 7) \\ \\ A=15700(\frac{69}{50}) \\ \\ \boxed{A=\$21,666}$

So Sara will owe in interest the following amount of money:

$I:Interest \\ \\ \\ I=21,666-15,700 \\ \\ \boxed{I=\$5,966}$

Finally, answering the questions:

1. How much interest will Sara owe?

She will owe 5,966 dollars

2. How much will the payments be with a seven year agreement?

Sara will pay 21,666 dollars

<h2>Learn more:</h2>

Simple interest: brainly.com/question/11911443

#LearnWithBrainly

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3 years ago

Which steps can be taken to translate the phrase “the height of a tree is increased by seven inches” into an algebraic expressio

borishaifa [10]

Answer:

Replace “the height of a tree” with a variable, x

Replace “increased by” with an addition symbol

Replace “seven inches” with the number 7.

Write the expression X + 7

Step-by-step explanation:

we have the phrase

“The height of a tree is increased by seven inches”

Let

x------> the height of a tree

1) Replace “the height of a tree” with a variable, x

2) Replace “increased by” with an addition symbol (+)

3) Replace “seven inches” with 7.

4) Write the expression X + 7

therefore

The algebraic expression is

$X+7$

6 0

3 years ago

Read 2 more answers

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s344n2d4d5 [400]

Step-by-step explanation:

v=u+at

at=v-u

a=v-u/t

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3 years ago

6a3-5b2+2c2-3a2bc if a=5 b=2c=-1

I am Lyosha [343]

6a3-5b2+2c2-3a2bc if a=5 b=2c=-1

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3 years ago

Please explain and solve!!! You won't get points unless you explain!!!

konstantin123 [22]

Area of a rectangle of length L and width W is A = LW.

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The area of this rectangle will be greater than 60 sq ft if x>4 ft. (answer)

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3 years ago

Simplify the expression 7.8n²+0.5+9n-.0.4-7n+n²​

Simplify the expression 7.8n²+0.5+9n-.0.4-7n+n²