The probability of getting heads at least once = 1 - the probability of getting tails all 4 times.
<span>Ans = 1 - (1/2)(1/2)(1/2)(1/2) = 1 - (1/16) = 15/16</span>
Look at the picture below.
I hope this helps!
Answer:
76 degrees
Step-by-step explanation:
We know that supplementary angles equal 180 degrees. So, set up the equations:




Then, you just plug 89 back into ZB, and simplify:


So, the measurement of angle ZB is 76 degrees.