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3 years ago

A^4 + 3a² - ( 5a - 3)(-7a) Please show work!!

1 answer:

7 0

$a^4+3a^2-(5a-3)(-7a)\ \ \ \ |\text{use distributive property}\\\\=a^4+3a^2-[(5a)(-7a)+(-3)(-7a)]\\\\=a^4+3a^2-(-35a^2+21a)\\\\=a^4+3a^2+35a^2-21a\\\\=a^4+38a^2-21a$

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One carpet cleaning cost are shown in the table. The relationship is linear. Find and interpret the rate of change and the initi

Ainat [17]

I see from the given data that each additional carpet after the first costs $50 each to have cleaned.

The first costs $125. Supposing we subtract $50 from that, we get $75. So, it sounds like it costs $75 just to get the carpet cleaners to your house.

The rule would then be $75 + $50x, where x : {1, 2, 3, 4, .... }

Let's check this result. Suppose x = 1. Will the charge be $125, as show in the table? $75 + $50(1) = $125. Correct.

Suppose x = 4. Will the charge be $275 as shown in the table?
$75 + $50(4) = $275. YES

4 0

4 years ago

Is it A. B. C. D. I really need help .

ss7ja [257]

I think the answer you’re looking for is
B. 9
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5 0

3 years ago

What is the solution of (2/x-1)>(7/x+1)

Rudiy27

(2 / x-1)> (7 / x + 1)
For this case we can solve the problem graphically.
The solution will be the shaded region.
Note: see attached image.
Answer:
The solution is given by:1 <x <9/5

8 0

4 years ago

Read 2 more answers

Help thanksSSSSSSSSSS

Setler79 [48]

Answer:

$\boxed{\sf{x=24}}$

Step-by-step explanation:

GIVEN:

To find the missing number in the proportion, you have to isolate it the term of x from one side of the equation.

$\sf{\dfrac{8}{7}=\dfrac{x}{21} }$

First, thing you do is switch sides.

$\sf{\dfrac{x}{21}=\dfrac{8}{7} }$

Multiply by 21 from both sides.

$\Longrightarrow: \sf{\dfrac{21x}{21}=\dfrac{8*21}{7} }$

Solve.

Multiply the numbers from left to right.

Use the order of operations.

PEMDAS stands for:

Parentheses
Exponents
Multiply
Divide
Add
Subtract

$\Longrightarrow: \sf{\dfrac{8*21}{7}=\dfrac{168}{7}=24 }$

$\Longrightarrow: \boxed{\sf{x=24}}$

Therefore, the final answer is x=24.

I hope this helps. Let me know if you have any questions.

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2 years ago

Is a negative and a positive equal a negative or positive in mutiplication

ZanzabumX [31]

If you multiply a negative number by a positive number, you get a negative product. if you were to multiply two positive or two negative numbers, you'd get positive products.

8 0

3 years ago