Perfect square trinomial: (a – b)2 = (a – b)(a – b) = a2 – 2ab + b2 find the product of (k – 9)2 using the perfect square trinomial rule shown on the left. the product (k – 9)2 can also be written as

Perfect square trinomial:

(a – b)2 = (a – b)(a – b) = a2 – 2ab + b2

Find the product of (k – 9)2 using the perfect square trinomial rule shown on the left.

The product (k – 9)2 can also be written as

✔ (k – 9)(k – 9)

.

The product is k2 –

✔ 18

k +

✔ 81

.

Step-by-step explanation:

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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18.75 gallons

step-by-step explanation: