Which is the best method for solving the system? and explain why it is the best

9x+ 8y=7
18x-15y=14

a:table
b:elimination
c:graphing
d:substiution

Answer:

The answer to your question is: 1 bag of apples cost $6.

Step-by-step explanation:

We need to write an equation:

1 bag of apples + 3 cartons of strawberries = $18

but 1 bag of apples = 1.5 cartons of strawberries

So

1.5 cartons of strawberries + 3 cartons of strawberries = $18

simplify   4.5 cartons of strawberries = 18

                1 carton of strawberries = 18/ 4.5 = 4

finally         1 bag of apples = 1.5 (4) = 6

Answer:

$6.00

Step-by-step explanation:

Answer:

850

Step-by-step explanation:

Current profit per year = $ 20

Number of subscribers = 3000

For each additional subscriber over 3000, the profit will increase by 1 cent or by $ 0.01. For example, for 3001 (3000 + 1) subscribers, the profit will be $ 20.01 per year. Similarly, for 3002 (3000 + 2) subscribers, the profit will be $20.02 per year and so on.

So, for x additional subscribers over 3000, the profit will increase by 0.01(x). i.e. for (3000 + x) subscribers, the profit will be $(20 + 0.01x)

Since, profit per each subscriber is $(20 + 0.01x), the profit for (3000 + x) subscribers will be:

Total profit = Number of subscribers x Profit per each subscriber

Total profit = (3000 + x)(20 + 0.01x)

We want to calculate how many subscribers will be needed to bring a profit of $109,725. So, we replace Total profit by $109,725. The equation now becomes:

[tex]109725=(3000+x)(20+0.01x)\\\\ 109725=60000+30x+20x+0.01x^{2}\\\\ 0.01x^{2}+50x+60000-109725=0\\\\ 0.01x^{2}+50x-49725=0\\[/tex]

Using quadratic formula, we can solve this equation as:

[tex]\\ x=\frac{-50 \pm \sqrt{50^{2}-4(0.01)(-49725)}}{2(0.01)}\\\\ x=\frac{-50 \pm67}{0.02}\\\\ x=\frac{-50-67}{0.02} , x=\frac{-50+67}{0.02}\\\\  x=-5850, x=850[/tex]

x = -5850 is not a possible solution as this would make the total number of subscribers to be negative. So we reject this value.

Therefore, the answer to this question is 850. 850 more subscribers are needed to being a total profit of $109,725

Final answer:

To bring a total profit of $109,725, the Vilas County News needs an additional 4,969,500 subscribers, totaling 4,972,500 subscribers in all.

Explanation:

The total profit of $109,725 can be calculated as follows:

Current profit = $20 x 3,000 = $60,000

Extra profit per additional subscriber = 1¢ or $0.01

Let x be the number of additional subscribers needed

Total profit equation: $60,000 + $0.01x = $109,725

Solve for x: $0.01x = $49,725

x = 49,725 / $0.01 = 4,972,500 subscribers

To find the additional subscribers needed: 4,972,500 - 3,000 = 4,969,500

Answer:

You must wait 60 minutes for all three lines to arrive at Union Station at the same time again.

Step-by-step explanation:

The complete question in the attached figure

Step 1

Find the least common multiple (LCM) of the three numbers

List the prime factors of each number

[tex]10=(2)(5)\\12=(2^2)(3)\\15=(3)(5)[/tex]

Multiply each factor the greatest number of times it occurs in any of the numbers to find out the LCM

The LCM is equal to

[tex](2^2)(3)(5)=60[/tex]

therefore

You must wait 60 minutes for all three lines to arrive at Union Station at the same time again.

Answer:

∠A = 99°

Step-by-step explanation:

Complementary angles sum to 180°, thus

∠A + ∠B = 180 ← substitute values

2x - 23 + x + 20 = 180

3x - 3 = 180 ( add 3 to both sides )

3x = 183 ( divide both sides by 3 )

x = 61

Hence

∠A = 2x - 23 = (2 × 61) - 23 = 122 - 23 = 99°

Answer: Lets rewrite our equation.

x + y + kz - 5z =k

x + y -5z = k(1-z)

k = [tex]\frac{x + y - 5z}{1 - z}[/tex]

so the only problem with the equation is that z can't be equal to one.

but x and y are free, so you have two free variables and one equation,

that means that for any k the system has infinitely many solutions.

Final answer:

To determine the nature of solutions in a system of equations involving k, we can check the determinant of the coefficient matrix. If the determinant is not zero, there is a unique solution; if it is zero, there are infinitely many solutions; and if contradictory, the system is inconsistent.

Explanation:

For which value(s) of k does this system have a unique solution?

For which value(s) of k does the system have infinitely many solutions?

For which value(s) of k is the system inconsistent?

By using sample space we can say that complement of 4 heads in the toss of 4 coins is at least one tail .

set of all possible outcomes experiment is called sample space .

To find compliment of 4 heads we will first find sample space Sample space= S

= { HHHH, HHHT, HHTH, HHTT, HTHH, HTHT, HTTH, HTTT, THHH, THHT, THTH, THTT TTHH, TTHT, TTTH, TTTT }

Given case is 4 heads Say A= { HHHH}

Now we can calculate A complement as

A' = S-A

= { HHHH, HHHT, HHTH, HHTT, HTHH, HTHT, HTTH, HTTT, THHH, THHT, THTH, THTT TTHH, TTHT, TTTH,TTTT }- { HHHH}A'={ HHHT, HHTH, HHTT, HTHH, HTHT, HTTH, HTTT, THHH, THHT, THTH, THTT TTHH, TTHT, TTTH,TTTT }

By using sample space we can say that complement of 4 heads in the toss of 4 coins is at least one tail .

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The complement of 4 heads in the toss of 4 coins is 'at least one tail', which includes any outcome where at least one coin lands on tails, encompassing all possibilities except for the exact outcome of 4 heads.

The student is asking about the concept of the complement in probability when flipping coins. Specifically, the complement of getting four heads in the flip of four coins. In probability, the complement of an event is all the possible outcomes that are not part of the event itself. In the case of flipping four coins, the event of getting four heads (HHHH) has a complement that consists of any outcome that does not have four heads. That includes outcomes with at least one tail.

Therefore, the complement of getting four heads is at least one tail, meaning any outcome where at least one coin lands on tails. All the outcomes with 0 heads and 4 tails, 1 head and 3 tails, 2 heads and 2 tails, or 3 heads and 1 tail would be part of this complement.

Since the question refers to the flip of four coins, only the following outcomes (macrostates) are possible: 0 heads (all tails), 1 head, 2 heads, 3 heads, or 4 heads (all heads). The complement of '4 heads' would comprise all outcomes except for '4 heads', reaffirming that the correct answer is at least one tail.

Answer:

-5/2(3x+4)<6-3x

2•-5/2(3x+4)<2(6-3x)

-5(3x+4)<2(6-3x)

-15x-20<12-6x

-15x+6x-20<12-6x+6x

-9x-20<12

+20 +20

-9x<32

-9 -9

x>32/-9 or -3.5 recurring

Answer:  2.4 miles

Step-by-step explanation: law of cosines

Let's call the distance between Brielle and Eduwa's cottages x. As the angle btw them is 43°, we can use:

x² = 3.5² + 2.8² - 2*3.5*2.8*cos43

x² = 5.755

x = 2.4 miles

Answer:

216

Step-by-step explanation:

72 + (72×2)=

72 + 144 =

216

Answer: Hello!

So the list of ingredients in the sauce are:

{onions,​ garlic, carrots,​ broccoli, shrimp,​ mushrooms, zucchini, green​ pepper}

there are 8 possible elements in the sauce, so we need to see the combinations for this elements in the sauce.

let's count!

0 ingredients; there is only one combination with 0 ingredients.

1 ingredient: there are 8 combinations with 1 ingredient, one for each.

2 ingredients: now star playing with combinatorics, so the combinatory between A and B is: [tex]\frac{A!}{B!(A-B)!}[/tex], so for 8 and 2 we get:

[tex]\frac{8!}{2!(6)!} = 8*7/2 = 28[/tex]

3 ingredients: Similar as before; the combinatory for 8 and 3 is: [tex]\frac{8!}{3!*5!} = 8*7 =56[/tex]

4 ingredients: for 8 and 4 we have: [tex]\frac{8!}{4!*4!} = \frac{8*7*6*5}{4*3*2} = 2*7*5 = 70[/tex]

5 ingredients: You can think that now we are counting the combinations of 3 ingredients that we are not using, so the combinations are the same as for 3 ingredients: 56

6 ingredients: Similar as before, here are the combinations of the two ingredients that we are not using: 28

7 ingredients: there are 8 options if we decide to not use only one ingredient.

8 ingredient: there is 1 option in this case, same as the case with no ingredients

And now, we need to add all those combinations:

so C = 1 +8 +  28 + 56+ 70+ 55 + 28 +8 +1 = 512 total combinations.

Through the application of combinations in Probability theory, we can determine that there are 256 potential ways to order pasta with tomato sauce, considering the inclusion or exclusion of eight possible ingredients.

The question pertains to combinations in Probability theory, specifically involving pasta with options to include or exclude eight different sauce ingredients: onions, garlic, carrots, broccoli, shrimp, mushrooms, zucchini, and green pepper. For each ingredient, we have two choices - either to include it or not, giving us 28 options, where 8 is the total number of ingredients.

To calculate the number of combinations, we use the formula for combinations which is 2n, where 'n' is the number of items. In this case, n equals eight as there are eight ingredients. Therefore, plugging into the formula, we get 28 = 256. So, there can be a total of 256 combinations when ordering pasta with tomato sauce considering the options of eight ingredients to include or not.

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Answer:

L= z z -$13

Step-by-step explanation:

We will write "L" for Linda and" z z" for Juan.

As linda spent $13 less than Juan, It is that Linda spent $13 less than zz.

We must substract $13 to what zz spent to obtain what Linda spent. That is,

L = zz - $13

The algebraic expression for how much Linda spent is z - 13, where z represents how much Juan spent.

To represent how much Linda spent, we can use the algebraic expression z - 13.

We will write "L" for Linda and" z z" for Juan.

Since Linda spent $13 less than Juan,

we subtract 13 from the amount Juan spent to get the amount Linda spent.

As linda spent $13 less than Juan, It is that Linda spent $13 less than zz.

We must substract $13 to what zz spent to obtain what Linda spent. That is,

L = zz - $13

So the expression for how much Linda spent is z - 13.

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Answer:

see explanation

Step-by-step explanation:

let y = f(x) and rearrange making x the subject, that is

y = [tex]\frac{2x-3}{x+1}[/tex] ← multiply both sides by (x + 1)

y(x + 1) = 2x - 3 ← distribute left side

xy + y = 2x - 3 ( subtract y from both sides )

xy = 2x - 3 - y ( subtract 2x from both sides )

xy - 2x = - 3 - y ← factor out x from each term on the left side

x(y - 2) = - 3 - y ← divide both sides by y - 2

x = [tex]\frac{-3-y}{y-2}[/tex] factor out - 1 on numerator and denominator

x = [tex]\frac{-(3+y)}{-(2-y)}[/tex]

Change y back into terms of x, thus

[tex]f^{-1}[/tex](x) = [tex]\frac{3+x}{2-x}[/tex] = [tex]\frac{x+3}{2-x}[/tex]

Answer:

f-1(x) = (x + 3)/ (2 - x) or -(x + 3 / (x - 2).

Step-by-step explanation:

Let y = (2x - 3)/(x + 1)

We find x in terms of y:

Cross multiply:

y(x + 1) = 2x - 3

xy + y = 2x - 3

y + 3  =  2x - xy

x(2 - y) = y + 3

x =  (y + 3) / (2 - y)

Now replace x by f-1(x) and y by x, we get:

f-1(x) = (x + 3)/ (2 - x).

Your answer was correct. You  found the same result written in a different form.

If we multiply  the above by -1 / -1 we get

-(x + 3) / -(2 - x)

= -(x + 3) / (x - 2).

Answer:

YXZ= 56 degrees

Step-by-step explanation:

Add the angles and set them equal to 180. Then solve for x. then Pug it in 2x+28.

Answer: [tex]\angle{YXZ}=56^{\circ}[/tex]

Step-by-step explanation:

Given : ∠WXY and ∠YXZ are supplementary angles.

∠WXY= 8x+12   and   ∠YXZ = 2x+28

We know that the pair of supplementary angles are added up to 180°.

According to the question, we have

[tex]\angle{WXY}+\angle{YXZ}=180^{\circ}\\\\\Rightarrow\ 8x+12+2x+28=180\\\\\Rightarrow\ 10x+40=180\\\\\Rightarrow\ 10x=180-40\\\\\Rightarrow\ 10x=140\\\\\Rightarrow\ x=\dfrac{140}{10}=14[/tex]

Now, [tex]\angle{YXZ}=2(14)+28=56^{\circ}[/tex]

Hence, the measure of  [tex]\angle{YXZ}=56^{\circ}[/tex].

Answer:

The probability of choosing exactly 2 male and 4 female students =[tex]\frac{\binom{16}{2}\times \binom{19}{4}}{\binom{35}{6}}[/tex]

Step-by-step explanation:

We are given that a class has 35 students

Number of male=16

Number of female=19

We have to choose 6 students for committee

We have to find the probability that exactly 2 male students are selected

Probability=P(E)=[tex]\frac{number\;of\;favorable\;cases}{total\;number\;of\;cases}[/tex]

If we have to choose total 6 student in which 2 male and 4 female

Combination formula:

[tex]nC_r=\frac{n!}{r!(n-r)!}[/tex]

Using the formula

The probability of choosing exactly 2 male and 4 female students =[tex]\frac{\binom{16}{2}\times \binom{19}{4}}{\binom{35}{6}}[/tex]

The probability of not choosing a white marble from a bag containing 10 marbles of different colors is 80%.

To find the probability that you will NOT choose a white marble from a bag containing 1 blue, 4 yellow, 3 red, and 2 white marbles (10 marbles in total), follow these steps. First, calculate the total number of marbles that are not white. There is 1 blue, 4 yellow, and 3 red marbles, summing up to 8 marbles that are not white. The probability of picking a marble that is not white is therefore the number of marbles that are not white divided by the total number of marbles.

Probability = Number of marbles that are not white / Total number of marbles
Probability = 8 / 10
Probability = 0.8 or 80%

Thus, the probability of choosing a marble that is not white is 80%.

Answer:

Q(2, 6 )

Step-by-step explanation:

Using the midpoint formula

let the coordinates of Q = (x, y ), then

0.5(x + 10) = 6 ( multiply both sides by 2 )

x + 10 = 12 ( subtract 10 from both sides )

x = 2

and

0.5(y + 6) = 6 ( multiply both sides by 2 )

y + 6 = 12 ( subtract 6 from both sides )

y = 6

Coordinates of Q = (2, 6 )

Answer:

=20.5

Step-by-step explanation:

1. use the Pythagorean theorem: a^2+ b^2=c^2  (arms+legs squared=hypotenuse)

2. plug in the numbers to the equation:

14^2+15^2=c

225+196=c^2

421=C^2

the square root of 421 is 20.5 which is the hypotenuse of the triangle

Answer:

C

Step-by-step explanation:

For this problem, the point where the line changes its slope is the focus point. The trick for this is to find the x point for the point. You have to look at he absolute value parenthesis, for this just put the opposite negative value of the number being added or subtracted inside the parenthesis. The "b" (y=mx+b) for the equation, isn't changed at all, so -2 would be the y value.

Answer: 25%

Step-by-step explanation: To write a fraction as a percent, first remember that a percent is a ratio of a number to 100. If we want to write 1/4 as a percent, we need to find a fraction equivalent to 1/4 with a 100 in the denominator. We can do this by setting up a proportion.

[tex]\frac{1}{4}[/tex] = [tex]\frac{n}{100}[/tex]

Now, we can use cross products to find the missing value.

4n = 100

÷4     ÷4    ← divide by 4 on both sides

  n = 25

Therefore, 1/4 is equivalent to 25%.

Answer:

The answer to your question is: 24 561 104 bacteria

Step-by-step explanation:

every 16 minutes bacteria population double

There are 6140276 bacteria at 9:15 AM

estimate bacteria at 9:47

First calculate the minutes : 47 - 15 = 32 minutes

                                               and 32 / 16 = 2

then 2 times the bacteria population double

So,

          first time = 6140276 x 2 = 1 2280552 bacteria

          second time = 1 2280552 x 2 = 24561104 bacteria

Answer:

Step-by-step explanation:

When I am dealing with fractions I put them in money wise so 2 1/4 would be like 2.25 and 3/8 would be like 0.75.

So that means you divide 2.25 by 0.75 and that will give you three.

Therefore Kia can make 3 small bags of candies.

have a nice day

please follow

Answer:

  They are both right.

Step-by-step explanation:

1 foot = 12 inches, so you have ...

  y = 12x . . . . . y is in inches and x is in feet.

  y = (1/12)x . . . y is in feet and x is in inches.

The constant of proportionality depends on how you write the conversion.

Jada and Lin are both correct depending on the direction of conversion. Jada's multiplier of 12 is correct when converting feet to inches, while Lin's multiplier of 1/12 is correct when converting inches to feet.

The subject here relates to the concept of proportionality and measurement conversions. Both Jada and Lin are correct depending on the direction of conversion. If we are converting feet to inches, then Jada is correct because one foot is equal to 12 inches, so the constant of proportionality is 12. However, if we are converting inches to feet, we would divide the number of inches by 12 to get the equivalent number in feet, which means in their case, Lin is correct as the constant of proportionality is 1/12.

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Answer:

Mars: 0.103 *(Real weigh)

Venus: 0.9 * (Real weigh)

Jupiter 2.53 * (Real weigh)

Step-by-step explanation:

The formula is this:

GM/r**2

M= Mass

r = radius

You do not need G for comparing between different masses or planets.

Answer:

The answer to your question is 900 black and white copies

Step-by-step explanation:

Data

9 black and white copies for every 2 colored

printed 200 color copies

black and white copies = ?

Process

                 This is a proportion exercise

                         BW : C ::  bw : c

                          9 : 2 ::  bw : 200

                         bw = 200(9) / 2

                         bw = 1800 / 2

                         bw = 900 copies

Answer:

Step-by-step explanation:

It can be useful to graph the inequalities related to Tyler's limits of money and weight.

  1x +3y ≤ 36 . . . . . . the limit on the cost of the items Tyler can afford

  1x +1.5y ≤ 20 . . . . . the limit on the weight of the items Tyler can carry

Then plotting the given points shows that only (2, 10) and (4, 5) are in the doubly-shaded area that is the solution space. The other points are not a solution.

Answer: B. 3,276,000

Step-by-step explanation:

Given : A student number system for a county requires that the student number be 6 characters.

Number of digits (0,1,2,3,4,5,6,7,8,9)=10

Number of letters in English alphabet = 26

When repetition of things is not allowed then we use Permutations.

Number of permutations of m things taking n at a time =[tex]^mP_n=\dfrac{m!}{(m-n)!}[/tex]

Similarly, Number of permutations of 10 numbers taking 4 at a time :

[tex]^{10}P_4=\dfrac{10!}{(6)!}=\dfrac{10\times9\times8\times7\times6!}{6!}=5040[/tex]

Number of permutations of 26 letters taking 2 at a time :

[tex]^{26}P_2=\dfrac{26!}{(2)!}=\dfrac{26\times25\times24!}{24!}=650[/tex]

Now, the possible number of numbers can be make = [tex]5040\times650=3,276,000[/tex]

Hence, the correct answer is options (b).

Answer:

  x = -2

Step-by-step explanation:

The line of reflection is the perpendicular bisector of the segment between a pre-image point and its image. For example, the segment HH' is bisected by x=-2, the line of reflection.

Answer:

97

Step-by-step explanation:

We are asked to find the size of sample to be 95% confident that the error in psychologist estimate of mean reaction time will not exceed 0.01 seconds.

We will use following formula to solve our given problem.

[tex]n\geq (\frac{z_{\alpha/2}\cdot\sigma}{E})^2[/tex], where,

[tex]\sigma=\text{Standard deviation}=0.05[/tex],

[tex]\alpha=\text{Significance level}=1-0.95=0.05[/tex],

[tex]z_{\alpha/2}=\text{Critical value}=z_{0.025}=1.96[/tex].

[tex]E=\text{Margin of error}[/tex]

[tex]n=\text{Sample size}[/tex]

Substitute given values:

[tex]n\geq (\frac{z_{0.025}\cdot\sigma}{E})^2[/tex]

[tex]n\geq (\frac{1.96\cdot0.05}{0.01})^2[/tex]

[tex]n\geq (\frac{0.098}{0.01})^2[/tex]

[tex]n\geq (9.8)^2[/tex]

[tex]n\geq 96.04[/tex]

Therefore, the sample size must be 97 in order to be 95% confident that the error in his estimate of mean reaction time will not exceed 0.01 seconds.

Answer:

B

Step-by-step explanation:

6 machines complete the job in 12 days;

the more machine you have faster the job will be done, inverse proportion

6 machines ---  12 days

x machines -- 8 days

you reduce the number of days by a factor of 1.5 (12/1.5)

sou you hvae to increase the number of machines by 1.5

6 x 1.5 = 9, so you will need 3 additional machines

Explanation:

Given Statement: Gerald bought his first car after saving up $5,000.

The conditional conjunction after identifies the dependent clause, the one corresponding to the "if" statement in a conditional.

Conditional Statement:

If Gerald saved $5000, then he bought his first car.

__

Converse Statement:

If Gerald bought his first car, then he saved $5000.

__

Inverse Statement:

If Gerald did not save $5000, then he did not buy his first car.

__

Contrapositive Statement: (converse of the inverse)

If Gerald did not buy his first car, then he did not save $5000.

__

Biconditional Statement:

If and only if Gerald saved $5000, then he bought his first car.