Use the figure to answer question 20 & 21. (20) Find the measure of angle a.
A 85
B. 45
C. 50
D. 20
(21)Find the measure of angle b
A 50
B 20
C45
D 85

The probability that an adult possesses a credit card is .70. a researcher selects two adults at random. by assuming the independence, the probability that the first adult possesses a credit card and the second adult does not possess a credit card is:

If sin(x) = 0 and cos(x) = 1, what is tan(x)?

The figure shows triangle def and line segment bc, which is parallel to ef: triangle def has a point b on side de and point c on side df. the line bc is parallel to the line ef. part a: is triangle def similar to triangle dbc? explain using what you know about triangle similarity. part b: which line segment on triangle dbc corresponds to line segment ef? explain your answer. part c: which angle on triangle dbc corresponds to angle f? explain your answer. asap