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3 years ago

Someone help meeee lollll

Mathematics

1 answer:

den301095 [7]3 years ago

6 0

Answer:

Step-by-step explanation:

The best way to do this is to first remove the parenthesis by distributing the negative into them. Then we will group the like terms together, moving their respective signs with them, then we will simplify. For the first one, after distributing the negative into the parenthesis (remember that a negative in front of a set of parenthesis containing a polynomial changes the signs in front of each term within the polynomial; negatives become positives and positives become negatives):

$3x^2-6x+11-10x^2+4x-6$ and then grouping like terms next to each other:

$3x^2-10x^2-6x+4x+11-6$ (this step is not completely necessary; I just encourage new learners to do it so as to not miss any of the like terms)

The above then simplifies to

$-7x^2-2x+5$

The next one, after distributing the negative into the parenthesis:

$-3x^2-5x-3+10x^2+7x-2$ and then grouping like terms next to each other (remember to move their signs with them!):

$-3x^2+10x^2-5x+7x-3-2$ which simplifies to

$7x^2+2x-5$

Now for the last one:

$12x^2+6x-5-5x^2-8x+12$ and

$12x^2-5x^2+6x-8x-5+12$ which simplifies to

$7x^2-2x+7$

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Solve for “x” 2(x-3)=2x+5

Naya [18.7K]

Answer: No value for x

Step-by-step explanation:

Open the bracket

2x-6=2×+5; combine like terms

2×-2×=5+6

0=11

6 0

3 years ago

At the space center, Karen bought a model of a shuttle. She started working on the model the next day at 11:13 A.M. She worked u

goblinko [34]

Answer:

58 minutes.

Step-by-step explanation:

From the question, Karen worked on the model in two windows;

1) 11.13 AM - 11.54 AM = 41 minutes

2) 1.29 PM - 1.46 PM = 17 minutes.

Hence, the total amount of time Karen spent working on the Shuttle model is:

41minutes + 17minutes = 58 minutes.

3 0

2 years ago

A rectangular tank that is 5324 ft cubed with a square base and open top is to be constructed of sheet steel of a given thicknes

marishachu [46]

Answer:

Side of 22 and height of 11

Step-by-step explanation:

Let s be the side of the square base and h be the height of the tank. Since the tank volume is restricted to 5324 ft cubed we have the following equation:

$V = s^2h = 5324$

$h = 5324 / s^2$

As the thickness is already defined, we can minimize the weight by minimizing the surface area of the tank

Base area with open top $s^2$

Side area 4sh

Total surface area $A = s^2 + 4sh$

We can substitute $h = 5324 / s^2$

$A = s^2 + 4s\frac{5324}{s^2}$

$A = s^2 + 21296/s$

To find the minimum of this function, we can take the first derivative, and set it to 0

$A' = 2s - 21296/s^2 = 0$

$2s = 21296/s^2$

$s^3 = 10648$

$s = \sqrt[3]{10648} = 22$

$h = 5324 / s^2 = 5324 / 22^2 = 11$

4 0

3 years ago

Twenty less than 8 times a number is the same as 15 more than the number

anygoal [31]

$x-\ number\\\\
8x-20=15+x\ \ \ | subtract\ x\\\\
7x-20=15\ \ \ | add\ 20\\\\
7x=35\ \ \ | divide\ by\ 7\\\\
x=5\\\\Number\ is\ 5.$

6 0

3 years ago

Please HELP!! ILL GIVE BRAINLEST! QUCIK PLEASE HELP!!

Elena-2011 [213]

Answer:

d. linear; $25/hour

Step-by-step explanation:

From looking at the graph, we have that renting for 2 hours costs $50, for 4 hours costs $100, for 6 hours costs $150, and for 8 hours costs $200. To find out whether the quantities described in the table are linear, we have to see if there is a constant rate of change of price.

For hour 2 to hour 4, we can see that the price increases by $50. This is the same for hour 4 to hour 6 and hour 6 to hour 8. For every 2 hour time interval, the price increases by $50. Therefore, there is a constant rate of change and the quantities described in the table are linear.

Now we have to find the constant rate of change per hour. We know that the price increases by $50 every 2 hours, so, by dividing both the hours and price increase by 2, the price increases by $25 per hour. So the constant rate of change is $25/hour.

Linear. $25/hour

Answer choice d.

I hope you find my answer and explanation to be helpful. Happy studying.

6 0

3 years ago