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Mandarinka [93]
3 years ago
12

What property is -4 + (-3/7)+(-4/7)+7

Mathematics
2 answers:
gizmo_the_mogwai [7]3 years ago
8 0
The answer is 2 but i'm not really sure about it
Rufina [12.5K]3 years ago
7 0
Commutative, it has parentheses and you do those first, hence moving around the equation
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Please prove this........​
Crazy boy [7]

Answer:  see proof below

<u>Step-by-step explanation:</u>

Given: A + B + C = π    →     C = π - (A + B)

                                    → sin C = sin(π - (A + B))       cos C = sin(π - (A + B))

                                    → sin C = sin (A + B)              cos C = - cos(A + B)

Use the following Sum to Product Identity:

sin A + sin B = 2 cos[(A + B)/2] · sin [(A - B)/2]

cos A + cos B = 2 cos[(A + B)/2] · cos [(A - B)/2]

Use the following Double Angle Identity:

sin 2A = 2 sin A · cos A

<u>Proof LHS → RHS</u>

LHS:                        (sin 2A + sin 2B) + sin 2C

\text{Sum to Product:}\qquad 2\sin\bigg(\dfrac{2A+2B}{2}\bigg)\cdot \cos \bigg(\dfrac{2A - 2B}{2}\bigg)-\sin 2C

\text{Double Angle:}\qquad 2\sin\bigg(\dfrac{2A+2B}{2}\bigg)\cdot \cos \bigg(\dfrac{2A - 2B}{2}\bigg)-2\sin C\cdot \cos C

\text{Simplify:}\qquad \qquad 2\sin (A + B)\cdot \cos (A - B)-2\sin C\cdot \cos C

\text{Given:}\qquad \qquad \quad 2\sin C\cdot \cos (A - B)+2\sin C\cdot \cos (A+B)

\text{Factor:}\qquad \qquad \qquad 2\sin C\cdot [\cos (A-B)+\cos (A+B)]

\text{Sum to Product:}\qquad 2\sin C\cdot 2\cos A\cdot \cos B

\text{Simplify:}\qquad \qquad 4\cos A\cdot \cos B \cdot \sin C

LHS = RHS: 4 cos A · cos B · sin C = 4 cos A · cos B · sin C    \checkmark

7 0
3 years ago
Given: ABCD is a ∥-gram; DE ∩ AB =F <br> Prove: △ADF∼△CDE
Vedmedyk [2.9K]

Answer:

By AA similarity

Step-by-step explanation:

We have been given that ABCD is a parallelogram

So, by the property of parallelogram AB ||CD and FD is cutting the line BC

Hence, FD is transverse line. In transverse line alternate angles are equal.

Therefore, ∠AFD=∠EDC  (alternate interior angles)

And ∠FAD=∠ECD (opposite angles in parallelogram)

Therefore, by AA similarity △ADF∼△CDE

5 0
3 years ago
Ratinal numbers are real numbers
tatuchka [14]
What's Ratinal? Do you mean rational? If so, you're right.
4 0
3 years ago
Find the unknown angle<br> 60°<br> Xº<br> 30°
densk [106]

Answer:

x = 90°

Step-by-step explanation:

Hello!

The sum of angles on a straight line is 180°.

To find the value of angle x°, we can subtract all the given angles form 180°.

<h3>Find x</h3>
  • 180° - 60° - 30° = x°
  • 180° - 90° = x°
  • 90° = x°

The value of x is 90°.

3 0
2 years ago
A pizza parlor offers 5 different pizza toppings. How many different kinds of 2-topping pizzas are available?
Gelneren [198K]
So let's pretend there is olives, pepperoni, jalapenos, sausage, and pineapple. Here is an example of an outcome chart that is useful when it comes to these type of problems.

                 sausage
                     l
pineapple-olives-pepperoni
                     l
              jalapenos
           

1. Olives and sausages
2. olives and pepperoni
3. olives and jalapenos
4. olives and pineapple
5. sausages and pepperoni
6. sausages and jalapenos
7. sausage and pineapple
8. pepperoni and jalapenos
9. pepperoni and pineapple
10. pineapple and jalapenos

There are 10 total 2 topping pizzas possible.

Now I'm hungry...

Hope this helps!

8 0
3 years ago
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