6 +8+2 4+5.1 pls help

11

Step-by-step explanation:

Use BEDMAS (Brackets, Exponents, Division, Multiplication, Addition, Subtraction).

6 + 8 ÷ 2 - 4 + 5 · 1

Calculate the division and the multiplication first.

6 + 4 - 4 + 5

Calculate this addition and subtraction problem.

= 11

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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step-by-step explanation:

x² + 11x + 18 < 0  

[-11 ± sqrt(121 - 72)]/2 = (-11 ± 7)/2  

solution: (-9, -2)

step-by-step explanation: