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Readme [11.4K]
3 years ago
8

Help me please with common core!!

Mathematics
2 answers:
Karolina [17]3 years ago
6 0

You're question is:

- 0.35 - (-0.25)

Note that two negatives = one positive

-0.35 - (-0.25) = -0.35 + 0.25

Combine. Subtract.

-0.35 + 0.25 = 0.25 - 0.35

0.25 - 0.35 = - 0.1

-0.1 is your answer

hope this helps

d1i1m1o1n [39]3 years ago
3 0

Ok, common core is hard. I grew up and graduated without it, so if it's ok, I'm just going to show you how to do it without common core.......


The first way you can do it is:.....

So, we can see that there is a negative sign right in front of the parenthesis there.... There is also a negative sign in front of -0.25. Because of this, it's a rule of thumb that we can automatically get rid of both of those negative signs and make them positive

So, your new equation should look like -0.35 + 0.25

When we add it all together, we get -0.1


The second way you can do it is by foiling. So as I'm sure you know, when there isn't a number by a negative sign, we automatically assume it's one. So when we add a 1 behind the only negative sign that doesn't have a number, we can do -1 * -0.25 = 0.25

Then, like before, our equation turns out the same: -0.35+0.25 = -0.1

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a chord of 12cm long of 8cm is away from the of the circle what is the lenght of the chord which is 6cm away from the centre
lana66690 [7]

Answer:

The length of the chord is 16 cm

Step-by-step explanation:

Mathematically, a line from the center of the circle to a chord divides the chord into 2 equal portions

From the first part of the question, we can get the radius of the circle

The radius form the hypotenuse, the two-portions of the chord (12/2 = 6 cm) and the distance from the center to the chord forms the other side of the triangle

Thus, by Pythagoras’ theorem; the square of the hypotenuse equals the sum of the squares of the two other sides

Thus,

r^2 = 8^2 + 6^2

r^2= 64 + 36

r^2 = 100

r = 10 cm

Now, we want to get a chord length which is 6 cm away from the circle center

let the half-portion that forms the right triangle be c

Using Pythagoras’ theorem;

10^2 = 6^2 + c^2

c^2 = 100-36

c^2 = 64

c = 8

The full

length of the chord is 2 * 8 = 16 cm

5 0
3 years ago
Please help with my math
shusha [124]

Answer:

Step-by-step explanation:

These triangles are similar triangles, so there is a number that you can multiply the sides of TUV to find the side lengths of QRS. looking at the triangle, the similar sides are RS being similar to UV and RQ being similar to UT.

If RS~UV, then there is a ratio between them. 54/36=1.5. The ratio is 1.5.

RQ~UT, and by a factor of 1.5, so divide RQ by the scale factor. 24/1.5=16. UT=16=x+5.

x+5=16, subtract 5 from both sides.

x=11

5 0
3 years ago
A retired math teacher takes her niece shopping. She tells her niece that they can spend x dollars and
pashok25 [27]

Answer:

Division. The niece can divide both sides of the equation by 19 to find the answer.

Let me know if this helps!

8 0
3 years ago
PLS HELP ME.
yarga [219]

Answer:

15092cm^3

Step-by-step explanation:

The total thickness of the strip of metal sheet  would be 2*10=20cm

the new radius of the cylinder would be 9/2+20=24.5cm

Volume of a cylinder: ((pi)r^2)h

the height is 8cm

Volume : (22/7)*24.5^2*8

=15092cm^3

7 0
3 years ago
Video Example EXAMPLE 1 Find the linearization of the function f(x) = x + 1 at a = 3 and use it to approximate the numbers 3.98
Blizzard [7]

Answer:

  the linearization is y = 1/4x +5/4

  the linearization will produce <em>overestimates</em>

  the values computed from this linearization are ...

     f(3.98) ≈ 2.245

     f(4.05) ≈ 2.2625

Step-by-step explanation:

Apparently, you have ...

  f(x)=\sqrt{x+1}

from which you have correctly determined that ...

  f'(x)=\dfrac{1}{2\sqrt{x+1}}

so that f(3) = 2 and f'(3) = 1/4. Putting these values into the point-slope form of the equation of a line, we get the linearization ...

  g(x) = (1/4)(x -3) +2

  g(x) = (1/4)x +5/4

__

The values from this linearization will be overestimates, as the curve f(x) is concave downward everywhere. The tangent (linearization) is necessarily above the curve everywhere.

__

At the given values, we find ...

  g(3.98) = 2.245

  g(4.05) = 2.2625

4 0
3 years ago
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