4. Multiply. a) 3x (2x + 4)
d) 2y2 (V2 + 6)
g) x (x - y)
j) - 3pq (2p + 70)
m) - 8x (x2 - 2x + 1)
b) 5a (3a - 2)
c) 4p (5p2 - 1)
e) 7m2 (4 – 3m²) f) 3b3 (8 + 2b)
h) 4xy (2x + 3y) i) 2ab (5a? – 4b)
k) - 2bc (9b – 50) 1) – 5xy (3x2 – 6y?)
n) - 7a (2a² + 3a – 5) 0) – 2xy (3x² – 5xy – 4y?)​

14

step-by-step explanation:

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: