Answer:
A
Step-by-step explanation:
Given
(- 12x + 4) +
(6x + 8) ← distribute parenthesis
= - 9x + 3 + 3x + 4 ← collect like terms
= - 6x + 7 → A
Answer:
The three angles form a "linear triplet" , so their measures must add up to 
Step-by-step explanation:
Notice that the three angles add up to cover half a circle (therefore 180 degrees of angle. Such type of angle combination is called a "linear triplet" since they add up to give a straight line.
24, since 54-30 is 24, and 30+24 is 54.
Answer:12(x-360)=120
Step-by-step explanation: