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IRISSAK [1]
3 years ago
8

Find the value of x Round to the nearest tenth

Mathematics
2 answers:
Ira Lisetskai [31]3 years ago
6 0

Answer:

50

Step-by-step explanation:

use a ruler

viktelen [127]3 years ago
3 0

Answer: 63.4

Step-by-step explanation:

Just got it right on Acellus:)

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PLEASE HELP TIMED TEST
Paraphin [41]

Answer:

8

Step-by-step explanation:

How many more unit tiles must be added to the function

f(x)=x²-6x+1 in order to complete the square?

The easier, but usually not viable way: If we look at how many more tiles need to be added, we can see that each smaller sides is 1 unit. Thus, we need 8 more tiles to complete the square.

However, this is just an educated guess. If we didn't have a diagram or it was drawn badly, we would be wrong. Let's solve it algebraically.

Note:

completing the square is changing a quadratic equation (the format is

ax² + bx + c = 0)into a(x - d)² + e = 0. (an example of this is (a + b)² or (a - b)²)

This may be confusing, but look at an example:

x² + 4x + 4 = (x + 2)²

Also note that, (a - b)² = a² - 2ab + b²

If we substitute a = x, then we get:

x² - 2bx + b².

Now, all we need to do is find b.

If we know that 2bx = 6x, then we can divide both sides by 2x and get an answer of

2bx = 6x

b = 3.

Thus, b is 3.

Remember, to complete the square, we need to find b², which is

3² = 9.

Then, because they already give us a "1", we just need to add 9-1 = 8 more units.

Just in case, let's check the answer.

If we add 8 to the problem, we get:

x² - 6x + 1 + 8 =

x² - 6x + 9

As you can see, this follows the a² - 2ab + b² format, so we can factor it.

x² - 6x + 9 = (x - 3)²

This is a completed square. Thus, we need to add 8 more unit tiles.

5 0
3 years ago
Jesse bought 5.2 pounds of grapes for &7.75. Using the unit rate, how much would 3 pounds of grapes cost?
uysha [10]
Rounded, it would cost $4.50 :)
7 0
4 years ago
1. y = –x2 – 1
mrs_skeptik [129]
Hello, I will just explain the following items with respect to the base equation y=x^{2} since each item performs one or more translations and reflections among the given choices.

ITEM #1: y=- x^{2} -1
For this item we have the negative sign added to x^{2} and the added term -1. The negative sign would indicate that all y values would be multiplied by negative one thus we can expect the graph to be reflected across the x-axis.

Meanwhile, the added term -1 would tell us that all y values would be 1 lesser than the original. Thus the graph would be translated down by 1 unit.

ITEM #2: y=-(x-1)^{2} -1
For this translation we can still see the negative sign and the added term in the previous item thus we know that this graph is also reflected across the x-axis and translated down by 1 unit.

The only new change for this one is the -1 that is added inside the squared term. We can examine this by comparing y=x^{2} and y=(x-1)^{2}. Notice that y would be zero in the second equation only when the x value is 1, as opposed to when the x value was zero in the previous equation. This will lead us to conclude that the graph will also be translated right by 1 unit.

ITEM #3: y=x^{2}+1
Here we only have the added term +1 at the end of the equation. The translation here will work the same as when the added term was -1 with the only difference that, instead of translating the graph downward, we will have to translate it upward by 1 unit.

ITEM #4: y=-x^{2}
For this item we only have the negative sign added to the equation. We have already covered it in the previous items and the reflection will basically work the same for this one. The graph will also be reflected across the x-axis.

ITEM #5: y=-(x+1)^{2}-1
Here we can see three changes to the original equation. We have already covered the negative sign before the squared term and the added term -1 so we know that the graph will be reflected across the x-axis and translated down by 1 unit.

For the added 1 inside the squared term, the same rule for the one in item #2 follows only that this time it will be the other way around. The graph will be translated left by 1 unit.

ITEM #6: y=-x^{2}-2
Lastly, for this one, we only have the negative sign and the term -2 added to the equation. We have already tackled the negative sign so we know that the graph will be reflected across the x-axis.

For the added term, it will work the same as -1 but instead it will just be translated downward by 2 units. 
6 0
4 years ago
What is the equation of the line that passes through the point (4,-3)(and has a slope of 11?
emmasim [6.3K]

Answer: -3 = 11(4) + b

Step-by-step explanation: y = mx + b, -3 is the y, 11 is the slope (m), 4 is the x, b is the y-intercept which is unknown unless you solve for it.

6 0
3 years ago
I start a walk at 2.47pm. The walk takes 85 minutes. What time does the walk finish?
Komok [63]

Answer:

4:12pm

Step-by-step explanation:

85 minutes = 1 hour and 25 minutes

2:47pm  + 1 hour 25 minutes = 3:72 pm

72 minutes = 1 hour 12 minutes so add another 1 hour to 3 and the balance is 12 minutes so walk ends at 4:12pm

Another way to look at it is as follows:
After 13 minutes, the time is 2:47 + 0:13 = 3pm

Remaining time left is 85-13 = 72 minutes = 1 hour: 12 minutes. Add that to 3pm and you get 4:12pm

3 0
2 years ago
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