Hello there.
Explanation:
↓↓↓↓↓↓↓↓↓↓

First, subtract by 4 from both sides.

Second, simplify.

Third, divide by -1 from both sides.

Fourth, simplify.

Next, add by 3 from both sides.

Then simplify.

Therefore, divide by 2 from both sides.

Finally, simplify.

<u><em>Answer⇒⇒⇒⇒x=2</em></u>
Hope this helps!
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-Charlie
Answer:
x=4.956 im pretty sure
Step-by-step explanation:
Answer: option a.
Step-by-step explanation:
By definition, we know that:

Substitute
into the first equation, solve for the cosine and simplify. Then, you obtain:

As
then
:

Now we can find
:

Answer:
Total charge= -25
Step-by-step explanation:
Given :
Charges of some ions
Aluminium +3
Phosphate -3
Chloride -1
Silver +1
To find total charge on 8 phosphate,7 chloride and 2 Aluminium atoms
Aluminium +3 × 2 =+6
Phosphate -3 × 8 = -24
Chloride -1 × 7 = -7
total charge=
+6-24-7 =+6 -31
= -25