What is (12.2a + 9.7b) – (18.1b – 0.2a) – (6.7a + 6.8b), simplified?

5.7a - 18.2b

Step-by-step explanation:

Step 1: Write the equation

(12.2a + 9.7b) – (18.1b – 0.2a) – (6.7a + 6.8b)

Step 2: Open all brackets

12.2a + 9.7b - 18.1b + 0.2a - 6.7a - 6.8b

Step 3: Arrange all 'a' together and all 'b' together

12.2a + 0.2a - 6.7a + 9.7b - 18.1b - 6.8b

Step 4: Simplify

5.7a - 18.2b

!!

3-4

step-by-step explanation:

the answer is 3-4 because both 45 and 60 has a multiple of 15.

45/3=15

60/4=15

therefore the odds against selecting a red is 4-3

hello,

b) 62.47% of the students are between 14 and 18 years old.

step-by-step explanation:

mean = 15 and standard deviation = 2

student between 14 to 18

formula used z-score

for age 14 , z score

using z-table , p(z> -0.5)=0.3085

for age 18 , z score

using z-table , p(z< 1.5)=0.9332

p(-0.5< z< 1.5)=0.9332-0.3085 = 0.6247

thus, 62.47% of the students are between 14 and 18 years old.

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