what does x equal? Plus can u pls explain cuz I have a test friday

To solve the coin problem, two equations are set up, one for the total number of coins and another for the total value in dollars. By using the elimination method, we find that Kevin has 8 dimes and 15 quarters in his piggy bank.

To solve this problem, we assign variables to represent the number of each coin type: let 'd' be the number of dimes, and 'q' be the number of quarters.

Now, we can set up our two equations. The first equation represents the total number of coins:

d + q = 23.

The second equation derives from the total value of the coins:

0.10d + 0.25q = 4.55.

Multiplying the second equation by 100 to clear the decimals gives us;

10d + 25q = 455.

To solve the system, we can use either substitution or elimination. Here, we will use elimination.

If we multiply the first equation by 10 (giving 10d + 10q = 230), we can subtract it from the modified second equation to eliminate 'd':

(10d + 25q) - (10d + 10q) = 455 - 230, simplifying to 15q = 225.

Dividing both sides by 15 gives us q = 15, which indicates Kevin has 15 quarters.

Substituting 'q = 15' into the first equation gives us d + 15 = 23, which simplifies to d = 8.

Therefore, Kevin has 8 dimes and 15 quarters.

To begin evaluating an expression on a calculator, press the clear button first. Follow the correct input sequence for the specific operation, such as entering the number before the LOG key for logarithms, and manually apply rules for significant figures.

Operating a Calculator for Mathematical Expressions

Before evaluating an expression on a calculator, it is crucial to press the clear button to ensure no previous entries affect your calculation. In cases of complex operations, such as logarithms or working with scientific notation, it is essential to follow proper input sequence.

For example, to compute a logarithm, you typically enter the number and then press the LOG key. Alternatively, some calculators may require pressing the function key first, such as the LOG key, followed by the number.

Understanding your calculator's functions, such as the Shift or second function, is necessary for operations like inputting scientific notation (e.g., '10* function'). For negative numbers, use the +/- key.

For equilibrium problems involving roots, ensure you know how to perform square roots, cube roots, or higher roots. If you encounter difficulties, consider rearranging the keys or consult your instructor for guidance on using technology tools like the TI-83, 83+, 84, and 84+ calculators.

Mr. Vitorello spends $10,500 on rent annually, which is calculated by multiplying the monthly rent expense ($875, which is 35% of his monthly salary) by 12.

Mr. Vitorello spends 35% of his monthly salary on rent, which is $2,500 each month. To calculate how much he spends on rent each year, we first need to determine the monthly rent expense.

Monthly rent expense = 35% of monthly salary

= 0.35  imes $2,500

= $875

Now that we have the monthly rent expense, we can calculate the annual rent expense by multiplying the monthly amount by the number of months in a year.

Annual rent expense = Monthly rent expense  imes 12

= $875  imes 12

= $10,500

Therefore, Mr. Vitorello spends $10,500 on rent each year.

Answer:

Step-by-step explanation:

The equation P[ 1 + 0.208/12 ]¹² + $60 =  P[ 1 + 0.246/12 ]¹² will be used to solve the given problem so option (D) will be correct.

Compound interest is applicable when there will be a change in principle amount after the given time period.

For example, if you give anyone $500 at the rate of 10% annually then $500 is your principle amount. After 1 year the interest will be $50 and hence principle amount will become $550 now for the next year the interest will be $550, not $500.

For credit card A →

APR = 20.8%

Annual fee = $60

The total amount after 1 year will be = compound interest + annual fee

So,

P[ 1 + 0.208/12 ]¹² + $60

For credit card B →

APR = 24.6%

No annual fee

The total amount after 1 year will be = compound interest

So,

P[ 1 + 0.246/12 ]¹²

Given that all are equal

So,

P[ 1 + 0.208/12 ]¹² + $60 =  P[ 1 + 0.246/12 ]¹²

Hence "The equation P[ 1 + 0.208/12 ]¹² + $60 =  P[ 1 + 0.246/12 ]¹² will be used to solve the given problem".

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Answer:

This was the correct answer, I even provided proof from my own test. Hope this helps!

Step-by-step explanation:

Answer: 72

Step-by-step explanation: i did it a got it right

The equation 8n + 2 - 6n = 9 + 2n - 13 has only one solution, n = -3.

To solve the equation 8n + 2 - 6n = 9 + 2n - 13, we need to simplify both sides and combine like terms.
 Starting with the left side of the equation, 8n - 6n can be simplified to 2n. And on the right side, 9 - 13 is -4.  
So, we have 2n + 2 = -4. We can now subtract 2 from both sides to isolate the variable n. This gives us 2n = -6. To solve for n, divide both sides of the equation by 2: n = -3.

Therefore, the equation 8n + 2 - 6n = 9 + 2n - 13 has only one solution, n = -3.

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Probability is the likelihood, or chance, that a certain event will occur. The easiest way to understand probability is with coin tosses. Probability can also be applied in various fields such as medicine and stock market.

Probability is the likelihood, or chance, that a certain event will occur. The easiest way to understand probability is with coin tosses.

When you toss a coin, the chance of a head turning up is 50 percent. This is because a coin has only two sides, so there is an equal chance of a head or tail turning up on any given toss.

Probability can also be applied in various fields. For example, doctors use probability to determine the chance of a vaccination causing the disease the vaccination is supposed to prevent.

Stockbrokers use probability to determine the rate of return on a client's investments. In statistics, we study populations and use a sample to gain information about the larger population. Data are the result of sampling from a population.

To find y, first find the measure of the third interior angle. We'll call it x.

The triangle angle sum theorem allows us to create an equation to find x. Set the interior angle values equal to 180 and solve.

180 = 28 + 30 + x

Add the constants.

180 = 58 + x

Subtract 58 from both sides.

122 = x

Now, ∠x (which we now know measures 122°) is supplementary to ∠y. Set them equal to 180 and solve for y.

180 = 122 + y

Subtract 122 from both sides.

58 = y

m∠y = 58°

Nola studied for a total of 2 hours and 1/8 hours. She studied for 1/4 hours in the morning, 1 3/8 hours after school, and 1/2 hours before bed.

To find out how long Nola studied altogether, we need to add up the time she studied in the morning, after school, and before bed.

Convert the mixed fractions to improper fractions:

1 3/8 hours = 8/8 + 3/8 = 11/8 hours

Step 2: Add up the time she studied:

Total study time = 1/4 hours + 11/8 hours + 1/2 hours

Find a common denominator for the fractions:

The common denominator for 4, 8, and 2 is 8.

Convert all fractions to have the common denominator:

1/4 hours = 2/8 hours

11/8 hours (already in terms of 8)

1/2 hours = 4/8 hours

Add up the fractions:

Total study time = 2/8 hours + 11/8 hours + 4/8 hours

Simplify the sum:

Total study time = (2 + 11 + 4) / 8 hours

Total study time = 17 / 8 hours

Convert the improper fraction back to a mixed fraction:

Total study time = 2 hours and 1/8 hours

So, Nola studied for 2 hours and 1/8 hours altogether.

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We need to find which of the given statements are true.

The system of linear equations has no solutions.

First let us find what type of solution does the system have

The equations are

[tex]5x+2y=-4[/tex]

[tex]5x+2y=1[/tex]

So,

[tex]\dfrac{a_1}{a_2}=\dfrac{5}{5}=1[/tex]

[tex]\dfrac{b_1}{b_2}=\dfrac{2}{2}=1[/tex]

[tex]\dfrac{c_1}{c_2}=\dfrac{-4}{1}=-4[/tex]

So,

[tex]\dfrac{a_1}{a_2}=\dfrac{b_1}{b_2}\neq\dfrac{c_1}{c_2}[/tex]

This means the two lines do not intersect and are parallel.

Hence, the system of linear equations has no solutions.

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Dawson checks out two books from a library where there are four shelves with five dinosaur books each. After checking out the books, there are 18 dinosaur books left on the shelves.

The question posed involves Dawson, who likes to read books about dinosaurs, going to the library to check out two dinosaur books to read. Initially, there are four shelves with five dinosaur books on each shelf. To determine how many books are left after Dawson checks out two books, we can start by calculating the total number of books in the library's dinosaur collection.

Since there are four shelves and five books on each shelf, the total number of books is:

After Dawson checks out two books, the number of books that will be left on the shelves is:

Therefore, there will be 18 books remaining on the shelves after Dawson checks out his two dinosaur books.

Answer: Three

Step-by-step explanation:

Given: )Megan is picking out an outfit to wear.

The given list of outfits :-

Red shirt – Black pants

Red shirt – White pants

Red shirt – Blue pants

Pink shirt – Black pants

Pink shirt – White pants

Pink shirt – Blue pants

The name of colors of pants :- Black , White ,  Blue

⇒ The number of different-color pants =3

Therefore, there are three different color pants from which Meghan has to choose .

let l be the length of garden

let w be the width of garden

as per the question

l= w+8

320 = (l+8)*(w+8) - (l*w)

on solving the equations we get,

w =12

l =20

so the dimensions of the garden are 20 feet and 12 feet

The distance from checkpoint B to the starting line for the given right-angle triangle will be 16 yards.

A triangle is a closed, 2-dimensional shape with 3 sides, 3 angles, and 3 vertices.

In a triangle, the sum of all three angles is 180°

Triangle is a very common figure to deal with our daily life for example in our daily life to measure the height of any tower then there is a huge application of the right angle triangle.

As per the given right angle triangle,

Suppose the missing length is x.

By Pythagoras' theorem,

x = √(20² - 12²)

x = √(400 - 144) = √256 = 16

Hence "The distance from checkpoint B to the starting line for the given right-angle triangle will be 16 yards".

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Answer:

Batch 1:  Pineapple = 3 1/2; Banana = 1 2/5

Batch 2:  Pineapple = 8; Coconut = 4 4/5

Batch 3:  Banana = 1; Coconut = 1 1/2

Step-by-step explanation:

For Batch 1:

We know that coconut is 3/10 of the mixture, and we have 2 1/10 coconut:

3/10x = 2 1/10

Converting 2 1/10 to an improper fraction, we have

3/10x = 21/10

Divide both sides by 3/10:

3/10x ÷ 3/10 = 21/10 ÷ 3/10

To divide fractions, flip the second one and multiply:

x = 21/10 × 10/3 = 210/30 = 7

This means we have 7 total of the mixture.

1/2 of this is pineapple:  1/2(7) = 7/2 = 3 1/2

1/5 is banana:  1/5(7) = 7/5 = 1 2/5

For Batch 2:

1/5 of the total is banana; we have 3 1/5 banana:

1/5x = 3 1/5

Convert the second fraction to an improper fraction:

1/5x = 16/5

Divide both sides by 1/5:

1/5x÷1/5 = 16/5÷1/5

Flip the second fraction and multiply:

x = 16/5×5/1 = 80/5 = 16

We have 16 of the total shampoo.

Pineapple is 1/2 of this:

1/2(16) = 8

Coconut is 3/10 of the total:

3/10(16) = 48/10 = 4 8/10 = 4 4/5

For Batch 3:

Pineapple is 1/2 of the total.  We have 2 1/2 pineapple:

1/2x = 2 1/2

Convert the fraction on the right to improper:

1/2x = 5/2

Divide both sides by 1/2:

1/2x÷1/2 = 5/2÷1/2

Flip the second fraction and multiply:

x = 5/2×2/1 = 10/2 = 5

We have 5 total shampoo.

Banana is 1/5 of this:

1/5(5) = 1

Coconut is 3/10 of this:

3/10(5) = 15/10 = 1 5/10 = 1 1/2