Karla is given the equation 10x + 15 = 20 to solve. She says the solution is 1/2

Which reason justifies her solution?

A) Karla says that to solve the equation you first add 15 and then multiply by 10.


B) Karla says that to solve the equation you first multiply by 10 and then add 15.


C) Karla says that to solve the equation you first subtract 15 and then divide by 10.


D) Karla says that to solve the equation you first divide by 10 and then subtract 15.

Answers

Answer 1
the answer is c because you need to isolate the x
Answer 2
The answer is C.

you do the inverse of positive 15, which is negative 15. so put it on both side .

10x +15 =20
-15 =-15

to equal

10x =5

then divide 10 on both side

10x = 5
----- -----
10 10


x = 5/10 or 1/2

Related Questions

a butcher has 10 3/4 pounds of ground beef that will be process at $3.40 per pound. he divides the meat into 8 equal packages. to the nearest cent, what will be the price of each package? explain how you know that your answer is reasonable

Answers

It would equal about $4.60. 

Hayley begins solving this problem by combining like terms. 3x + 5x = 10 Which problem requires the same strategy (combining like terms)? A) 5x=20 B) 3(x + 5) = 20 C) x ÷ 4= 30 D) 3x - 2x = 10

Answers

D) 3x - 2x = 10 is the answer to this equation 

Answer:

D) 3x - 2x = 10

Explanation:

To combine like terms, you add or subtract terms that have the same variables and exponents.  In the problem we are given, 3x and 5x are like terms; we would add them together and then continue solving.

In choice A, there are no like terms to combine.

In choice B, we would use the distributive property; after that, there are no like terms to combine.

In choice C, we would cancel the 4; there are no like terms to combine.

Choice D has two like terms, 3x and 2x.  We would subtract them and then continue solving.

1. BAKING A recipe for 1 apple pie calls for 6 cups of sliced apples. How
many cups of sliced apples are needed to make 4 apple pies?
2. BASEBALL CARDS Justin bought 40 packs of baseball cards for a discounted
price of $64. If he sells 10 packs of baseball cards to a friend at cost,
how much should he charge?
3. SOUP A recipe that yields 12 cups of soup calls for 28 ounces of beef
broth. How many ounces of beef broth do you need to make 18 cups of
the soup?
4. ANIMALS At a dog shelter, a 24-pound bag of dog food will feed 36 dogs
a day. How many dogs would you expect to feed with a 16-pound bag
of dog food?
5. AUTOMOBILES Mr. Fink’s economy car can travel 420 miles on a 12-gallon
tank of gas. Determine how many miles he can travel on 8 gallons.

Answers

Answer:


Step-by-step explanation:


What is x? 3x+4y=70 and 8x-3y=9

Answers

I am pretty sure x is 6

soppose 8 out of every 20 students are absent from school less than 5days a year.predict how many students would be absent from school less than five days a year out of 40,000 students

Answers

All you need to do is set up simple fractions and cross multiply. the fractions are 8/20 and x/40000 you cross multiply to get 20x=320,000. you finally divide 20 on both sides to get 16000 students.

Hope this helps :)
Please mark my answer as the brainiest if you feel I've given you the best help :)

the foundation of a house sinking 5 inches positing or negative

Answers

It is sinking, so it is going down.
In a number line, going down is negative

your answer is -5 inch

hope this helps

5._4 - (_.8_) = -3.61
fill in the blanks please !!

Answers

5.24 - (8.85) = -3.61

Answer:

[tex]5.24-8.85=-3.61[/tex]

Step-by-step explanation:

We have been given an equation. We are asked to fill in the blanks for the given equation.

5._4 - (_.8_) = -3.61

We will find each part separately as:

For hundredths digit:

[tex]4-?=-1[/tex]  

[tex]4-4-?=-1-4[/tex]

[tex]-?=-5[/tex]

[tex]?=5[/tex]  

So hundredths digit would be 5.

Tenth digit:

[tex]?-8=-6[/tex]

[tex]?-8+8=-6+8[/tex]

[tex]?=2[/tex]

Ones digit:

[tex]5-?=-3[/tex]

[tex]5-5-?=-3-5[/tex]

[tex]-?=-8[/tex]

[tex]?=8[/tex]

Substitute the values in given equation.

5.24 - (8.85) = -3.61

We can verify our answer by subtracting 8.85 from 5.24.

[tex]5.24-8.85=-3.61[/tex]

Therefore, our equation would be [tex]5.24-8.85=-3.61[/tex].

I don’t understand how to do this, someone please help :)

Solve for y

Answers

| 2 | is absolute value, which means you turn the number inside to positive, which it already is. Because there is a negative symbol on the OUTSIDE of the lines, the 2 becomes a -2.

y = -2 + 10

-2 + 10 = 8

y = 8

Write 100,000 as a power of 10. A) 103 B) 104 C) 105 D) 106

Answers

 A)[tex]10^3[/tex] = 10 * 10 * 10 = 1,000
It is not A

B)[tex]10^4[/tex] = 10 * 10 * 10 * 10 = 10,000
It is not B

C)[tex]10^5[/tex] = 10 * 10 * 10 * 10 * 10 = 100,000
It could be C

D)[tex]10^6[/tex] = 10 * 10 * 10 * 10 * 10 * 10 = 1,000,000
It is not D

Your answer is C)[tex]10^5[/tex]

Hope I helped!

The number 100,000 is written power of 10 as [tex]10^5[/tex]. Therefore, option C is the correct answer.

The given number is 100,000.

We need to write 100,000 as a power of 10.

What is scientific notation?

To determine the power or exponent of 10, let us understand how many places we need to move the decimal point after the single-digit number.

If the given number is multiples of 10 then the decimal point has to move to the left, and the power of 10 will be positive.If the given number is smaller than 1, then the decimal point has to move to the right, so the power of 10 will be negative.

Now, 100,000 can be written as [tex]10^5[/tex].

The number 100,000 is written power of 10 as [tex]10^5[/tex]. Therefore, option C is the correct answer.

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the probability of picking a red marble from a bag of 30 marbles is 1/5. how many blue marbles must be removed from the bag to increase the probability to 1/4

Answers

Final answer:

To increase the probability from 1/5 to 1/4, we need to remove 24 blue marbles from the bag.

Explanation:

To increase the probability from 1/5 to 1/4, we need to find the number of blue marbles that need to be removed. Let's assume there are x blue marbles in the bag. Initially, the total number of marbles in the bag is 30, and the probability of picking a red marble is 1/5. This means that (30 - x)/30 = 1/5. Solving this equation, we get x = 24. Therefore, 24 blue marbles need to be removed from the bag to increase the probability to 1/4.

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Final answer:

Because the initial probability of picking a red marble from 30 marbles is 1/5, there are 6 red marbles in the bag. If we want to increase the probability of drawing a red marble to be 1/4, we need to reduce the total number of marbles in the bag to 24. So, we must remove 6 non-red marbles, which could be blue.

Explanation:

The subject of your question is probability in Mathematics. Initially, we have 30 marbles, and the probability of picking a red one is 1/5. So, there are 1/5 * 30 = 6 red marbles in the bag. Thus, the bag also contains 24 non-red marbles, which can be blue or other colors.

Next, we want the probability of picking a red marble to be 1/4. Since the number of red marbles will remain the same, we need to change the total number of marbles in the bag. If 'x' is the number of marbles in the bag, then 6/x = 1/4, which means x = 24. Since initially we had 30, to get to 24 we need to remove 6 marbles.

Therefore, if we remove 6 blue marbles (or any non-red marbles), the probability of picking a red marble will increase to 1/4.

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The rabbit population in a certain area is 500​% of last​ year's population. There are 300 rabbits this year. How many were there last​ year? There were rabbits last year.

Answers

There was 60 rabbits last year

500% - 5.00

300 / 5 = 60

 there were 60 rabbits last year

What can be answered with science?

Questions that are non-testable
Questions about things that can be measured
Questions that ask about an opinion
Questions that ask about a moral value

Answers

Question about things that can be measured.

Which number is the smallest? 4.4 ⋅ 10−5, 3.99 ⋅ 10−6, 2.6 ⋅ 102, 1.85 ⋅ 103

Answers

3.99×10^-6 is the smallest number

3. At a bargain store, Tanya bought 3 items that each cost the same amount. Tony bought 4 items that each cost the same amount, but each was $2.25 less than the items that Tanya bought. Both Tanya and Tony paid the same amount of money. What was the individual cost of each person's items? (a) Write an equation. Let x represent the cost of one of Tanya's items. (b) Solve the equation. Show your work. (c) Check your solution. Show your work. (d) State the solution in complete sentences. Answer:

Answers

3x = 4(x-2.25)

3x = 4x-9

add 9 to both sides

3x+9 =4x

subtract 3 x from each side

x=9

Tonya's items were $9 each

Tony's items were 9-2.25 = 6.75 each

check:

9*3=27

4 *6.75 = 27

If 60 equals twice a number added to itself, find the number.

Answers

Okay. 60 equals twice the number added to itself. That would be 30, because 60 is twice of 30 and 30 added to itself is 60. The number is 30.

Which is the best example of a number written in scienific notations?

A) .5 x 10^5
B) .1254
C) 5.367 x 10^-3
D) 12.5 x 10^2

Answers

C is the best example

Write the standard number for eighteen and forty-three thousandths

Answers

it will be 18,430 in standeard form
Final answer:

The standard number for 'eighteen and forty-three thousandths' is written as 18.043. We express the 'forty-three thousandths' part as .043 and combine it with the whole number 18.

Explanation:

The standard number for "eighteen and forty-three thousandths" is written in the decimal format. The whole number, in this case, is 18 and the decimal part is .043 when we express the words 'forty-three thousandths'. Combined together, the number is written as 18.043.

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Explain if you can. I'm really confused!

Answers

If you divide y/x it shouldn't be too hard to understand once you get it over with.

I need help to calculate (The three at the end is to the third power!)
(−1)3
Thank you!!!!!!

Answers

( -1) 3^3

( - 1 )  27 

- 27 is the answer
(-1)^3 =
-1 x -1 x -1
1 x -1
-1
So, (-1)^3 = -1

What numbers is divisible by 492,570

Answers

If you still mean divisible by, then multiply that number by any whole number and you have your number. ie 492,570*2.

If you mean the factors, then let me know.

5/8 times 1/2 in fraction form

Answers

Wait I almost got it it's that I'm dumb lo l

5/8 times 1/2 in fraction form is 5/16.

Here it is needed to find the product or the multiplication of the fractions 5/8 and 1/2.

Whenever a number is taken times to another number, the operation is multiplication.

Here the numbers are fractions.

For fractions, multiplication is in such a way that when two fractions are multiplied, multiply the numerators and the denominators separately and write it as such.

5/8 × 1/2 = (5 × 1) / (8 × 2)

               = 5/16

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what is the value of 412.321 if the underlined diget is 1 on the part .321?

Answers

The one on the part .321 is in the thousandths place

the underlined digit is the thousandths place 

William put 0.83 liter of water into a bucket. Matt put 0.98 liter of water into another bucket. When they combined their water into a bigger bucket 10% of the water spilled out. The water they collected had a weight of 1.021 kilograms per liter of water. The expression show below represents the weight, in kilograms, of the water in the bigger bucket. [0.9(0.83 + 0.98)] x 1.021 Rounded to the nearest thousandth, what is the weight, in kilograms, of the water in the bigger bucket?


1.663


1.748


1.763


1.848

Answers

I believe that the answer is A.

What is the quotient for -20/-2?

Answers

the quotient is 10 :)
10 because you just do -20 divided by -2

At the rate of $7.22 how much will Whitney eat in 40 hours

Answers

Let h = how much in 40 hours

h = 7.22(40)

You finish.
$288.80 HOPE IT HELPS

What is the value of t?

t−12/2=3t/2−3

A. –3
B. –1
C. 1
D. 3

Answers

Answer: -3

Step-by-step explanation:

(t-12)/2=(3t)/2-3

t-6=1.5t-3

t=3-6

t=-3

Hope this helps

We have that for the Question "What is the value of t?  

t-12/2=3t/2 -3" it can be said that the value of t is

[tex]t=-3[/tex]

Option A

From the question we are told

What is the value of t?  

t-12/2=3t/2-3  

A. –3

B. –1

C. 1

D. 3

Generally the equation for the statement  is mathematically given as

[tex]\frac{t-12}{2}=\frac{3t}{2}-3\\\\ Therefore\\\\\frac{t-12}{2}=\frac{3t}{2}-3\\\\Multiply through by the denominator which is 2\\\\ t-12=3t-6 \\\\ collecting like terms \\\\ t-3t= -6 +12 \\\\ therefore \\\\ t=-3 [/tex]

Therefore

the value of t is

[tex]t=-3[/tex]

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A newborn baby gained 9/16 of a pound in 1/4 of a month. What was the baby's growth rate in pounds per month?

Answers

The answer is 2 1/4 because you're trying to find the unit rate. 
9/16             1
-------   =   -------
 1/4              x
You cross multiply
9/16x = 1(1/4)
And solve for x, which gets you to two and a fourth.  

can you graph the equation?

Answers

yes. when x=1, y=.5. so basically just divide x by 2, then find where it is on the y- coordinate, and graph where it meets
Plug in x = 0 and it leads to y = 0. This is because 

y = (1/2)*x
y = (1/2)*0 ... x has been replaced with 0
y = 0

So the point (0,0) is on the graph of the equation.

Now plug in x = 2 and follow the same steps as above
y = (1/2)*x
y = (1/2)*2 ... replace x with 2
y = 1 
So x = 2 leads to y = 1 giving us the point (2,1)

Plot the points (0,0) and (2,1). Then draw a straight line through these two points to draw the graph of the equation.

See attached for a visual. 

Side Note: 1/2 = 0.5 so y = (1/2)x is the same as y = 0.5x

An internet bookseller charges $6 per paperback book plus a $3 shipping and handling fee per order. If Mr. Montoya spent $111 on books for his class, how many books did he buy?

Answers

You would add 6+3 which equals 9 and then you would divide 111/9 and you get 12.33333...
So he bought 12 books

Using the Pythagorean theorem, find the length of a leg of a right triangle if the other leg is 8 feet long and the hypotenuse is 10 feet long.

Answers

You have to use the formula. Its quite simple. Its a^2+b^2=c^2.

But since you are trying to find one of the legs than you would do it backwards. Since c is the hypotenuse, than youd do 10^2(which equals 100) subtracted by 8^2(which equals 64). This should give you 46. Than you would find the square root of 64 and that is your answer.
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