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4 years ago

I need some tips and examples for subtracting integers. Appreciated!

Mathematics

2 answers:

Tcecarenko [31]4 years ago

5 0

one tip:

Example: 4 - (-3)

it instantly becomes positive because the negatives are close to each other as shown.

hope that helps :)

gavmur [86]4 years ago

5 0

Since an integer is any whole (not fractional) number on the number line, all you have to do is move to the left however many units you're subtracting by from the point given. Say the problem is 3 - 7. This means we start at 3, and move to the left 7 units, which lands us at -4. However, if we had a problem like 12 - (- 2), the two negatives would cancel out, meaning we will move to the right 2 units on the number line, or 12 + 2, which is 14. Some other examples are:

-12 - 4, (you should get -16)

3 - 8, ( you should get -5)

16 - (- 3), ( you should get 19)

I hope these tips helped you out! I know that when I first had to subtract integers, using a number line really helped me out. Eventually, it'll just be a natural thing. :D

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Use the distance formula to find the distance between the points (−10,−9) and (−3,8).

gizmo_the_mogwai [7]

Step-by-step explanation:

the distance can be seen as Hypotenuse of a right-angled triangle with its legs being the x and y coordinate differences.

so, we use Pythagoras

c² = a² + b²

with c being the Hypotenuse (the side opposite of the 90 degree angle).

distance² = (-10 - -3)² + (-9 - 8)² = (-7)² + (-17)² = 49+289 =

= 338

distance = sqrt(338) = sqrt(2×169) = 13×sqrt(2) =

= 18.38477631...

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3 years ago

A hat is originally priced at $28 is on sale for $15% off. What is the total cost of the hat if the tax is 6.75%?

vampirchik [111]

You do 28, which is the original cost, then you take that 15% off to do that you multiply 28×.15 and you get 4.2 and subtract that from original cost and you get 23.8 then to get the cost after tax you do 23.8×.0675 and you get 1.6 then you add that to 23.8 and get 25.4 dollars

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4 years ago

What is StartFraction 3 pi Over 4 EndFraction radians converted to degrees? If necessary, round your answer to the nearest degre

Helen [10]

Answer:

135°

Step-by-step explanation:

To convert Radians to Degrees, you multiply the Radians amount by $\frac{180}{\pi}$ .

Thus, we get $\frac{3\pi }{4}$ * $\frac{180}{\pi}$

We then get $\frac{540\pi }{4\pi }$ , which simplifies into 135 degrees.

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2 years ago

Please help me with this question, image attached.

hichkok12 [17]

Answer:

corresponding angles

Step-by-step explanation:

<4 and <8 are corresponding angles

Corresponding angles are in matching corners on parallel lines

4 0

4 years ago

Read 2 more answers

A test worth 125 points has 49 questions on it. Multiple Choice questions are worth 2 points each and short answer questions are

Charra [1.4K]

Answer:

There were 40 2-point questions and 9 3-point questions.

Step-by-step explanation:

To solve this situation, write two equations. One for the number of questions and one for the number of points.

Let x be the number of 2 point questions.

Let y be the number of 5 point questions.

x + y = 49

Now since x are each worth 2 points, the total points is 2x.

And since y are each worth 5 points, the total points is 5y.

So 2x + 5y = 125. Substitute one of the equations into the other to solve for the variables.

x + y = 49 becomes x = 49 - y. Substitute it.

2(49-y) + 5y = 125

98 - 2y + 5y = 125

98 + 3y = 125

3y = 27

y = 9

Substitute y = 9 back into the equation x = 49 - y to find x.

x = 49 - 9

x = 40

5 0

3 years ago