41º
1) Since we want to find the reference angle for a -139º angle, we need to resort to the following formula
2) Note that a -139 angle is in quadrant III, since negative angles are clockwise oriented
3) Thus the Reference Angle is 41º
Answer:
4Na + 1O2 > 2Na2O
SF6 > 1S + 3F2
2FE2O3 > 4FE + 3O2
Step-by-step explanation:
1. Identify the Products and Reactants(always do O2 last)
2. determine how many atoms of each element are present on each side of the equation
3. Add Coefficients and never change the subscripts. If there's a coefficient in front of any compound, it is distributed to both elements.
4. find the total number of atoms on both sides of the equation and make sure they equal with each other
To solve this, add 17 to both sides:
x = -25 + 17
x = -8
It should be B. right angle and C. complementary angles
Answer:
5:45
Step-by-step explanation:
