Use distributive property to simplify 5(s-5t)

the answer is 5s- 25t

steps

1. distribute the 5 out, (5*s)+(5*5t)

2. solve and combine, (5s)+(25t)

3. answer 5s+25t

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

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b, i believe, but not sure.