please help with7 thru 12

Answer:

2

Step-by-step explanation:

Line segment of length k is divided into 3 equal parts.

so first segment is 0-k/3 and third segment is 2/3k-k

so mid-pt of 1st = k/6 and 3rd = 5/6k

so the distance in between = 5/6k-k/6 = 4/6k = 2/3k

ans is A

The distance between the midpoints of the first segment and the third segment is 2k/3. Hence, option A is the right choice.

The mid-point of a line segment is the point from which the distance to both ends of the line segment is equal.

In the question, we are given a line segment of length k units, which is divided into 3 equal parts.

We are asked to find the distance between the midpoints of the first and third segments.

Firstly, we divide the line segment at points k/3 and 2k/3, to get three equal parts of lengths k/3 each.

Now, the mid-point of the first segment = (0 + k/3)/2 = k/6.

The mid-point of the third segment = (2k/3 + k)/2 = 5k/6

Therefore, the distance between the midpoints of the first segment and the third segment is (5k/6 - k/6) = 4k/6 = 2k/3. Hence, option A is the right choice.

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Final answer:

The function y=2x+13 takes on a positive value for x > -6.5 and a negative value for x < -6.5.

Explanation:

The function y=2x+13 represents a linear equation. To find the values of x for which the function takes on a positive value, we need to solve the inequality 2x+13 > 0.

Subtracting 13 from both sides gives 2x > -13.

Dividing both sides by 2, we get x > -6.5.

Therefore, for x values greater than -6.5, the function will be positive.

To find the values of x for which the function takes on a negative value, we need to solve the inequality 2x+13 < 0. Subtracting 13 from both sides gives 2x < -13.

Dividing both sides by 2 and flipping the inequality sign, we get x < -6.5.

Therefore, for x values less than -6.5, the function will be negative.

There are a variety of methods of performing this subtraction, and corresponding different methods of regrouping.

If you're taught (as I was) to do the subtraction right-to-left, then the first regrouping you need to do is when you try to subtract 500 from 100. You must regroup the 8 thousands and 1 hundred to 7 thousands and 11 hundreds. Then, when you subtract 5 hundreds, you end with 7 thousands and 6 hundreds.

The next regrouping you need to do is when you try to subtract 6 ten-thousands from 5 ten-thousands. You must regroup the 2 hundred-thousands and 5 ten-thousands to 1 hundred-thousand and 15 ten-thousands. Then, when you subtract 6 ten-thousands, you end with 1 hundred-thousand and 9 ten-thousands.

The end result is

... 258,197 - 64,500 = 193,697

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If you use an abacus or soroban or similar tool to help you keep track of the numbers, you were likely taught to do the subtraction left-to-right. In this case, the first regrouping  comes when you want to subtract 6 ten-thousands. Practitioners of this method know that -6 = -10 +4, so the number represented on the tool becomes (2-1) hundred-thousands and (5+4) ten-thousands plus the rest of the initial number, or 198,197 after subtracting the 6 ten-thousands.

The subtraction proceeds until you find you need to subtract 500 from 100. At this point, the tool is representing the partial result as 194,197. Again, if you practice this method, you know that -5 = -10 +5, so you reduce the thousands digit by 1 (to 3) and add 5 to the hundreds digit to get 193,697.

_____

An attempt is made to show the regroupings in the attachment. In each case there are two of them. However, working left-to-right, the result of the first subtraction of 6 ten-thousands is 19 ten-thousands, so you never actually write down anything else. Of course, if you're using an abacus or soroban, you don't write down anything—you simply change the position of the beads on the tool.

Substitute the value of the variable into the expression and simplify.

1. 24

2. 17

(A) Subtracting the right side from both sides, we get ...

... (20 -4x) -(12 -x +8 -3x) = 0

... (20 -12 -8) +x(-4 +1 +3) = 0

... 0 = 0 . . . . . true for all values of x (infinite solutions)

(B) Subtracting the right side from both sides, we get ...

... (5x +4x -3) -(24 +8x) = 0

... x(5 +4 -8) +(-3 -24) = 0

... x -27 = 0

... x = 27 . . . . . . (one solution)

(C) Subtracting the right side from both sides, we get ...

... (5x +6) -(2x +6 +3x -15) = 0

... x(5 -2 -3) +(6 -6 +15) = 0

... 15 = 0 . . . . . . . not true for any value of x (no solutions)

View the image to see how I solved this problem.

There is an obvious factor of x², so we can reduce this to the problem of finding zeros of a quadratic by factoring that out. Then, we can determine the zeros of the quadratic factor to complete the finding of zeros for the function.

A factor of x² can be factored out, leaving ...

... f(x) = x²(x² +x +4)

The latter factor has only complex zeros. It can be rewritten by completing the square.

... x² +x +4 = (x² +x +1/4) +(3 3/4) = (x +1/2)² +(3 3/4)

So, the real zeros are where x² = 0, at x = 0. The complex zeros are where the above expression is zero, ...

... (x +0.5)² +3.75 = 0

... (x +0.5)² = -3.75

... x + 0.5 = √-3.75 = ±0.5i√15

... x = -0.5(1 ±i√15)

The function zeros are 0 (multiplicity 2) and -0.5±0.5i√15.

340 miles because you do 123-21 divided by 0.30.

I'm so smart!! :D

In y years, the loss is ...

... loss = 15y

Then in 6 years, the loss will be ...

... loss = 15·6 = 90

The loss of students for those 6 years will be 90 students.

Tony because he spent $19 while Mario spent $18. To explain, you would multiply 3 by $4 because Tony bought 3 of the $4 packs of pencils. Therefore, he would have spent $12. In addition, add $7 to $12, you get $19. On the other hand, Mario bout 4 of the $6 binders. That would mean he spent $24 on binders However, he had a $6 coupon which means he can take $6 off the total price of $24. That would mean subtracting $6 from $24. That would get Mario $18

Your answer is C.The relation passed the vertical line test.

Consider the ordering

... -2 < -1

Now consider the ordering of their absolute values:

... 1 < 2

_____

Hopefully, you see that changing the sign reflects the sequence across the origin, so that the ordering is reversed when the signs are changed.

D

to divide 2 fractions

• leave the first fraction

• change division to multiplication

• turn the second fraction upside down

• simplify if possible

= - [tex]\frac{3}{8}[/tex] × - [tex]\frac{7}{6}[/tex] = [tex]\frac{3(7)}{8(6)}[/tex] = [tex]\frac{7}{16}[/tex]

Try this solution (see the attachment, there is not the only way).

The short explanation: the target - to prove, PN≠OM; PN⊥OM; point S is midpoint of OM&PN, - the properties of rhombus.

The relation will not be a function if the to ordered pairs have the same first value. That will happen when

... 2k+3 = 3k-1

... 4 = k . . . . . . add 1-2k

The relation will not be a function when k=4.

The length of fence she will need to divide the garden is 9.22 m.

Rectangle is a quadrilateral (has four sides and four angles) in which both sides are parallel and opposite to each other.

Pythagoras theorem is used to show the relationship between the sides of a right angled triangle.

From the diagram, let x represent the length of the fence, hence using Pythagoras:

The length of fence she will need to divide the garden is 9.22 m.

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Note that the graph shows 8 dots with associated x-values 1 through 8.  The domain is the set of integers {1, 2, 3, 4, 5, 6, 7, 8}.  The range is the set of all y-values associated with this domain, a bit harder to read off the graph.  One by one, I will approximate the y-value associated with each x value and present these 8 y-values as the range:  {7.5, 9, 12, 15. 18, 22, 23}.

x = 5 or x = - 1

equate f(x) and g(x)

x² - 7x + 3 = - 3x + 8 ( subtract (- 3x + 8 ) from both sides )

x² - 4x - 5 = 0 ← in standard form

(x - 5)(x + 1) = 0

equate each factor to zero and solve for x

x - 5 = 0 ⇒ x = 5

x + 1 = 0 ⇒ x = - 1

Initial amount: $210,000

Setting aside: $50,000

Remaining: $160,000

3/4 of remaining amount: 160,000 times 0.75 = $120,000

1/4 of remaining amount: 160,000 times 0.25 = $40,000

A plot of the points shows you the triangle is an acute triangle.

_____

All angles are less than 90°.

DC = [tex]\frac{5}{2}[/tex] = 2.5

since the triangles are similar then the ratios of corresponding sides are equal

[tex]\frac{AC}{AD}[/tex] = [tex]\frac{BC}{DE}[/tex]

[tex]\frac{7.5+DC}{7.5}[/tex] = [tex]\frac{8}{6}[/tex] (cross-multiply )

45 + 6DC = 60

6DC = 60 - 45 = 15 ( divide both sides by 6 )

DC = [tex]\frac{5}{2}[/tex]

If you add the two purchases, you find 9 hotdogs and 9 hamburgers cost 24.75. One hotdog and one hamburger will cost 1/9 of that total, or 2.75.

... One hotdog and one hamburger costs $2.75.

_____

This is what your question asks. Usually, we want to know the individual costs of the items. If we multiply this total by 5, then we have the cost of 5 hotdogs and 5 hamburgers: 13.75. This $1.75 more than the cost of 5 hotdogs and 4 hamburgers, so the cost of a hamburger must be $1.75

... One hotdog costs $1.00

... One hamburger costs $1.75

Yes.  Notice that the Pythagorean Theorem applies here.  3^2 + 4^2 = 5^2, so this triangle is a right triangle.

Answer:

23

Step-by-step explanation:

The notation (f∘g)(1) means f(g(1)). We can first find g(1), then use that value as the argument to the f function.

g(1) = 2·1-6 = -4

f(-4) = -4(-4)+7 = 16+7 = 23

you can use a calculator and plug n 989x49 which equals 48461

989 times 49 is 48461

Hope this helps :)

Answer:

Your answer is 16√3 units2

Step-by-step explanation:

28/33 × 100% = 0.84848... × 100% ≈ 85%

Michael got about 85% of the available points.

_____

Since we're not told the number of points per question, we don't actually have enough information to answer the question.

To find out the percentage of correct answers, divide the number of correct answers by the total number of questions and multiply by 100. Michael got 85% of the questions correct on his math test.

To find out what percent of the questions Michael answered correctly, we need to divide the number of correct answers by the total number of questions and multiply by 100.

Here's the step-by-step calculation:

So, Michael got 85% of the questions correct on his math test.

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