Answer: 
Explanation:
The equation of the unit circle is 
Plug in y = -2/7 and solve for x
Answer:
I would say A. 7.8 x 10^-5
Step-by-step explanation:
7.8 x 10^-5 can also be written as 7.8 times 10 to the negative fifth power or the exponent of negative five. But, if you solve it you would get 0.000078 as the real number.
2/3 + w = 1 1/2
get a common denominator, 6
2/3 * 2/2 = 4/6
1/2 * 3/3 = 3/6
4/6 + w = 1 3/6
subtract 4/6 from each side
w = 1 3/6 - 4/6
change the 1 to a common denominator of 6
w = 6/6+ 3/6 - 4/6
W = 9/6 - 4/6
w = 5/6
Answer w = 5/6
33/5 hope that helppssssssss
