Answer:
3
Step-by-step explanation:
Let the missing number be
.
Then we have 
We expand the right hand side to get:

By comparing constant terms we get:

Divide both sides by -15

Therefore the missing number is 3
Answer:
68 degrees
Step-by-step explanation:
This triangle is an isosceles triangle which means that two sides have equal lengths and when two sides have equal lengths that means that two angles are the same. so you add 56 and 56 together and you get a sum of 112. all triangles add up to a degree of 180, so you therefore subtract 112 from 180 which gives you an answer of 68 degrees , therefore x is 68
Answer:
D, 5
Step-by-step explanation:
<span>Data:
</span><span>Hypotenuse is 7.5
Opposite of angle x is 6</span><span>
Cosine = Side opposite (S.O) the angle on the hypotenuse (h)
We have:
</span>



<span>For better understanding, see the annex:
</span>
Answer:
Commutative
Step-by-step explanation:
because both sides contain 4.3 + g in any order.