Issac has 21 marbles and 7 blue marbles he wants to place them in identical group without any marbles left

In which figure is de bc ? a. figure 1 b. figure 2 c. figure 3 d. figure 4

What’s the answer ? use the picture to see the problem

Select the correct answer. what is the exact value of sin (157.5°)? a. 'sqrt(2 - sqrt(2))/2 b. *"-"'sqrt(2 + sqrt(2))/29 c.'sqrt(2 + sqrt(2))/4" d. "-"sqrt(2 + sqrt(2))/4)