Find b. round to the nearest ! ! !

 56.0°

Step-by-step explanation:

Use the Law of Cosines:

b² = a² + c² - 2ac · cos B

20² = 22² + 18² - 2(22)(18) · cos B

400 = 484 + 324 - 792 · cos B

400 = 804 - 792 · cos B

-404 = - 792 · cos B

0.5151 = cos B

cos ⁻¹ (0.5151) = B

55.99 = B

56.0 ≈ B

percentage - 25%

probability - 0.25

we know,

total amount of students in class = 20

total boys = 10

total girls = 10

no of girls who wear glasses = 10/2 = 5

probability of choosing a girl with glasses is =

number of girls wearing glasses/total number of students in the class = 5/20

thus, percentage of selecting a girl wearing glasses will be

= 5/20 × 100

= 5 × 5

25%

therefore,

probability will be 0.25

happy to

pls mark as brainliest