Answer:
20°
Step-by-step explanation:
According to the question, pair of supplementary angles are x and 8x
since they are supplementary, their sum is equal to 180°
x+ 8x = 180°
9x= 180°
x= 180°/9
x= 20°
B ) sin² x = 1 - cos² x
sin² x + cos² x = 1 ( correct )
D ) cot² x = csc² x - 1
cos²x / sin²x = 1/sin²x - 1 = (1-sin²x) / sin²x = cos²x/sin²x
Identities are B ) and D).
The number is 6 because five times 6 is 30, and 30 minus 2 is 28. You could also solve this backwards in the future and take 28 plus 2 and then divide that number by 5 (opposite of subtracting 2 is adding two, opposite of multiplying by five is dividing by 5).
5x-2=28 (writing it this way might also help, because now you just have to solve for x)
-1, -1/2, -2 so solve it like this on the numberline
