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3 years ago

I need help! Does anyone know how to solve this?

Mathematics

1 answer:

viva [34]3 years ago

8 0

Your answer is 9 for this problem

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(3x^3-2x^2+4x-8)-(5x^3+12x^2-3x-4)

n200080 [17]

Answer: $-2x^3-14x^2+7x-4$

Step-by-step explanation:

$(3x^3-2x^2+4x-8)-(5x^3+12x^2-3x-4)$

Distribute the negative sign.

$(3x^3-2x^2+4x-8)-5x^3-12x^2+3x+4$

Remove the other parentheses.

$3x^3-2x^2+4x-8-5x^3-12x^2+3x+4$

Combine like terms.

$-2x^3-14x^2+7x-4$

3 0

3 years ago

Find the opposite reciprocal in quesrions 13-15 13) 2 14) -3/4 15) 1/3

larisa86 [58]

13.) - 1/2
14.) 1 1/3 (4/3)
15.) - 3

6 0

3 years ago

A speedometer has a percent error of 10%. The actual speed of the car is 40 mph. Select from the drop-down menus to correctly co

rodikova [14]

Answer

The speedometer is likely to show the speed is either 36.0 mph or 44.0 mph.

To prove

Formula

$Percentage\ error = \frac{error\times 100}{Exact\ value}$

Where error = |Approx value - Exact value |

First case

As given

A speedometer has a percent error of 10%. The actual speed of the car is 40 mph.

Here

Percentage error = 10%

Exact value = 40 mph

error = - (Approx value - Exact value )

= - (Approx value - 40 )

= - Approx value + 40

Put in the formula

$10 = \frac{(-Approx\ value + 40)\times 100}{40}$

$400 = {(-Approx\ value + 40)\times 100}$

$\frac{400}{100} =-Approx\ value + 40$

$\4 =-Approx\ value + 40$

Thus

Approx value = 40 - 4

Approx value = 36 mph

Therefore Option (b) is correct .

Second Case

error = (Approx value - Exact value )

= (Approx value - 40 )

= Approx value - 40

Put in the formula

$10 = \frac{(Approx\ value - 40)\times 100}{40}$

$400 = {(Approx\ value - 40)\times 100}$

$\frac{400}{100} = Approx\ value - 40$

$\4 = Approx\ value - 40$

Thus

Approx value = 40 + 4

Approx value = 44 mph

Therefore Option (c) is correct .

4 0

3 years ago

When the sum of 9 and a certain number is divide by 2 the result is equal to five times the original number minus 3 what ii the

pav-90 [236]

Answer: 20/3????

Step-by-step explanation:

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3 years ago

Bill has x pence.

Anna [14]

Ben has x pence, but Bill has 2x (twice more)

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2 years ago