Mathematics Middle School

Which of the following expressions is equivalent to the expression x - (-3) ?
x - 3
x + (-3)
x + 3
-3x

Answers

Answer 1
x + 3 because in math two negatives equal a positive
Answer 2
Final answer:

Subtracting a negative number is the same as adding its absolute value. Hence, the expression x - (-3) is equivalent to x + 3 in mathematics.

Explanation:

A negative number is equivalent to its absolute value when subtracted in mathematics. This is often referred to as the rule 'minus a negative is a positive'. Therefore, the correct answer is x + 3. This is because when you subtract -3 (which is a negative number), it is the same as adding 3. Here's the step by step explanation:

Start with the expression x - (-3). Recognize that subtracting -3 is the same as adding 3. Rewrite the expression as x + 3.

This means that x - (-3) is equivalent to x + 3.

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Related Questions

Dominique used the inequality below to find the maximum number of sweatshirts she could purchase with her savings.

32 x < 300

What is the greatest number of sweatshirts Dominique can purchase?

Answers

We just have to find the closest number that can be multiplied by 32 and still be under 300. Do this by following this step:

Divide by 32 on both sides.

x < 9.375

We can't buy 9.375 sweatshirts though, and we can't add more decimals or it will go over 300, so you round down to 9.

Dominique can buy 9 sweatshirts without going over $300!

Convert: y>3/2x-7/2 from point slope to standard form?

Answers

The goal is to get the inequality into the form Ax+By > C or Ax+By < C

First multiply both sides of the inequality by 2 to clear out the fractions
y > (3/2)x - 7/2
2*y > 2*( (3/2)x - 7/2 )
2y > 2*( (3/2)x ) + 2*( -7/2 )
2y > 3x - 7

Now get the x and y terms to one side; move the 7 to its own side
2y > 3x - 7
2y+7 > 3x - 7+7 ... add 7 to both sides
2y+7 > 3x
2y+7-2y > 3x-2y ... subtract 2y from both sides
7 > 3x-2y
3x-2y < 7 ... flip the two sides and the inequality sign

We finally have the inequality into the form Ax+By < C where 
A = 3
B = -2
C = 7

---------------------------------------------

The answer is 3x-2y < 7

Consider the graph of the linear function h(x) = –2/3x + 5. Which could you change to move the graph down 3 units?
the value of b to –3
the value of m to –3
the value of b to 2
the value of m to 2

Answers

Change the value of b to 2
By changing the y-int by 3 units, the graph will ultimately be 3 units down

C. The value of b to 2

Explanation: The change from 5-2 is 3.

y - 5 = 0.5x2 + 6x - 3 How many x-intercepts does this have?
 update!!! the answer is 2

Answers

The answer is actually 2 because you have 0.5x (I think that's what it's supposed to be) and 6x.
y = 0.5x^2 + 6x + 2      (adding 5 to both sides of the original equation)

Discriminant  b^2 - 4ac  =  6^2 - 4 * 0.5 * 2  =   36 -  4  = 32

The discriminant is positive and not a perfect square so the equation has 2 x intercepts.

write a linear equation that is parallel to 12x+3y=24 and passes through the point (-2,7)

Answers

In order to write the formula for another line which is parallel, we need the slope (m). Parallel lines never in fact touch or intersect at any one point. They are either the same lines, occupying the same points, or different parallel lines, never occupying the same points, but sharing the same slope (m).
If we put out equation in slope-intercept format: y = mx+b, we can obtain our needed m.
12x+3y=24 ->> 3y = -12x+24
3y/3 = (-12x+24)/3 ->> y = -4x+8, therefore our m = -4
Now we can use our info to make the line in point-slope format: y-y1 = m (x-x1)
So, y-7 = -4 (x--2) or y-7 = -4 (x+2)
You can leave it like that or convert it:
y-7 = -4x -8 ->> y = -4x -8+7 ->> y = -4x-1
or even in this format: 4x+y=-1

A square is 8 inches along each side. A rectangle is 6 inches wide and 10 inches long. Which shape has the greater perimeter? Explain.

Answers

they both have the same perimeter
Same perimeter
Square- 8+8+8+8= 32
8x4= 32
Rectangle- 6+6+10+10= 32

Toni can carry up to 13 lb in her backpack. Her lunch weighs 1 lb, her gym clothes weigh 2 lb, and her books (b) weigh 2 lb each. How many books can she carry in her backpack?

Answers

Toni can carry 5 books in her bag

1713 hours is the same as which of the following times a.7:13 a.m b.5:13 p.m c.7:13 p.m d.5:13 a.m. i pick d.5:13 a.m

Answers

Answer:

5:13 pm

Step-by-step explanation:

Since a day has 24 hours and if midnight is 000 hours and noon is 1200 hours you just have to count to 17 and think, or you could count on your fingers, what is the distance between 12 and 17, which is 5, and since it is after noon it is p.m, so 5 pm plus the 13 minutes it is 5:13 p.m.

Walter is mixing cement for his new patio. He knows he needs to water-to-cement ratio of 20-30. What percent of his total mixture is water?

Answers

The ratio of water to cement is 20:30 meaning that for every 20 parts of water, we have 30 parts of cement. There are 20+30 = 50 parts total.

Divide the number of parts of water (20) over the total number of parts (50)
20/50 = 2/5 = 0.40
use a calculator or long division to find the decimal form of 2/5 to be 0.40

Then move the decimal point 2 spots to the right to go from 0.40 to 40%

Answer: the percent of water in the mix is 40%

Final answer:

To find the percentage of water in Walter's mixture with a water-to-cement ratio of 20-30, the water part is 20 out of 50 total parts, which equates to 40% of the mixture being water.

Explanation:

Walter needs a water-to-cement ratio of 20-30 for his patio cement mixture. To find out what percent of his total mixture is water, we can interpret the ratio as a fraction and then convert that fraction to a percentage. The fraction for water is 20 parts out of a total of 20 (water) + 30 (cement) parts, which is 20/50. To convert this to a percentage, we multiply by 100%.

Calculating the percentage: (20/50) × 100% = 40%

Therefore, 40% of Walter's total mixture is water.

A graphic designer charges an hourly rate. In July, the only expense is for advertising. The function graphed models the designer's net income, y, for July for x hours of work.

Select True or False to describe each statement.

I guessed on this question, but I'm not 100% sure. Please help! 

Answers

The first one is false, but the other two are true.

Actually you have the answers correct I took the test.

find an equivalent expression to 3 (4m-2)-2(m+5). write your answer as an expression with two terms

Answers

12m-6-2m+10 (10m+4) is the simplest it can go

Answer:

10m - 16

Step-by-step explanation:

3 (4m-2) -2(m+5)

The equivalent expression can be simplified as an expression with two terms as follows:

3 (4m-2) -2(m+5)

Open each parenthesis by multiplying the outside value with the values in the parenthesis.

3 (4m-2) = 12m - 6

-2(m + 5) = -2m -10

Bring the value together

12m - 6 -2m  - 10

collecting like terms

12m -2m - 6 - 10

10m - 16

List all the possible ways to write life.

Answers

In life nothing is impossible
no solution for this

Brad wants to buy flowers for his friend with 45$. The daisies are 1$ each and the roses are 2$ each. He buys 3 more daisies than roses. How much did the roses cost?

Answers

I did the math, which wasn't too hard if you knew how to solve it.

There will be 14 roses, which is worth $28. 14($2)

And finally there will be 17 daisies, which is worth $17. 17($1)

$28+$17=$45

please vote my answer brainliest. thanks!

Does Anyone know how many time can 4 go into 0

Answers

4 can go into 0 0 times
The answer is zero. You can't divide 0 by anything

Explain how to model 3 groups of 6.

Answers

lets say groups = g

3 groups of 6 is 

3(g) =6

3g/3  = 6/3

g = 2

there are 2 in each group

hope this helps

Jasmine bought 7 yards of fabric. The total cost was $45.43. What was the average cost per yard of the fabric she bought?

Answers

Cost per yard  = 45.43 / 7  =  $ 6.49

Answer: $6.49

Step-by-step explanation:

$45.43 / 7=$6.49

Joesl's father is 45. He is 15 years older than twice joe's age. How old Is joe?

Answers

Joe is 15, 45-15=30 30/2=15

The football team lost 4 yards on 2 plays in a row. Which of the following could represent the change in field position?

Answers

Lost (⬅key word) 4 is equal to -4
On 2 plays that is times 2
So all together is -4×2
A negative times a positive is negative
-4×2= -8
Hope this helped you☺
Final answer:

The football team lost 4 yards on 2 plays in a row, resulting in a change in field position of -8 yards.

Explanation:

The football team lost 4 yards on 2 plays in a row. To determine the change in field position, we need to subtract the total yardage lost from the starting field position. Assuming the starting field position was at the 50-yard line, the change in field position would be -4 yards x 2 plays = -8 yards. Since the team lost yardage, the change in field position would be a negative value.

Dilation of 1.5 j (-1,-1 ) u(1,3) w(0,-2)

Answers

J (-1.5,-1.5) u (1.4,4.5) w(0,-3)

for a class gardening project 1/3 of mrs gordon's students planted marigolds and 1/2 planted tulips what fraction of the class planted either marigolds or tulips

Answers

Get them to have a common denominator so you can add them
(1/3)×2= 2/6 and (1/2)×3= 3/6
Add them together
(2/6)+ (3/6)= 5/6
So 5/6 of the class planted either marigolds or tulips and 1/6 of the class planted neither

A store manager realizes that he has too many jeans in stock. After he finished taking inventory, he has a total of 688 jeans. He decides to reduce the stock by having a buy one get one free sale. So every purchase will reduce the inventory by 2 pair of jeans. In this expression: 688-2x, what does the term 2x represent?

Answers

The "2x" on the expression represents the 2 pair of jeans lost per buy. (Reducing the inventory by 2 pair of jeans)

if h(x)=3^x-7 find h(4) show all work
[tex]h(x) = {3}^{x} - 7[/tex]

Answers

Just substitute 4 for x in the given equation:

h(4) = 3^4 - 7 = 81 - 7 = 74 (answer)
h(x) = (3^x) - 7
h(4) = (3^4) - 7 ... replace every x with 4; then use PEMDAS to simplify
h(4) = 81 - 7 
h(4) = 74

Answer: 74

Side Note: 3^4 means we have four copies of '3' being multiplied together
3^4 = 3*3*3*3 = 9*9 = 81

what does it mean to solve the system of equation?

Answers

Solving a system of equations usually means that you solve for a variable in a specific equation. Systems of equations consist of 2+ equations that contain the same variables.

Ex :

2x + 2y = 8
3x + 3y = 9

Then, using those equations, you solve for x & y

~Hope I helped!~

Ciara brought $240 to spend on gifts for her family. She found 8 identical statues at a gift shop. She had $72 leftover. How much did each statue cost?

Answers

each statue costed 21 dollars
Hello! In order to solve this problem, first, you have to subtract the 72 dollars she didn’t spend on statues from 240. 240 - 72 = 168. That’s $168 she spent on statues. She bought 8 of them. Now, divide the total cost by 8. 168/8 = 21. There. Each statue Ciara bought costed $21.

Maia's calculator displays a number as 9.125e10. What is this number in standard form?

Answers

I'm going to assume that it's 9125 x 10^7 (sorry if it's not correct)

or it's 9.125 x 10.
Sorry I do not understand how to do this

Plz send help ???????????????????????

Answers

You have 18.6.
You need to find the smallest number that would round up to 18.6.
It is 18.55
Since the last digit is the hundredths place is a 5, to round to the nearest tenth, you drop the last 5 and the first five becomes 6 giving you 18.6.
Answer: 18.55

expand and simplify (x-3)(x+7)

Answers

Let's multiply each term for the other one.

I mean: x*x; x+7; -3*x; -3*7

So x²+7x-3x-21

We add up like terms.

Final answer: x²+4x-21
x(x+7) -3(x+7)
x² + 7x -3x -21
x² +4x -21

that's the answer
if you understand and it's correct. don't forget to make my answer the brainliest

Evaluate 3x + y when x = 1/3 and y = -7/4

Write the answer in simplest form

Answers

Given:
3x + y
Substitute the variables for x = 1/3 and y = -7/4:
3 · 1/3 + -7/4
Multiply 3 by 1/3:
1 + -7/4
Add -7/4 to 1:
-3/4
Final answer:

The expression 3x + y simplifies to -3/4 when x equals 1/3 and y equals -7/4.

Explanation:

To evaluate the expression 3x + y when x = 1/3 and y = -7/4, we simply substitute these values into the expression.

So 3x + y becomes 3*(1/3) - 7/4, which simplifies to 1 - 7/4.

To simplify this further, we convert 1 (which is the same as 4/4) and -7/4 to have the same denominator (which is 4). So, 4/4 - 7/4 equals -3/4.

So, the simplest form of 3x + y when x = 1/3 and y = -7/4 is -3/4.

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The most efficient first step in the process to factor the trinomial 3x3-24x2+36 is

Answers

you have to do the multiplication step, if there are any numbers being multiplied

B. Factor out 3x. on apex quite simple

Anita recorded the daily high and low temperatures as 13°F and-3°F,respectively wrote the difference in temperature,in °F, as a subtraction equation. Then write the difference in temperatures as an addition equation

Answers

13 - (-3) = 16 and 13 + 3 = 16. A number minus a negative is the same as addition 
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